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How to Quote Sources – Comprehensive Guide With Examples

Published by Olive Robin at October 17th, 2023 , Revised On October 17, 2023

In academia, research, journalism, and writing, the skill of quoting sources is fundamental. Accurate and proper quoting adds credibility to your work and demonstrates respect for the original authors and their ideas. Whether you’re working on a research paper , an essay , or any other form of written communication, understanding how to quote sources is crucial. This comprehensive guide will take you through the ins and outs of quoting, with examples and tips to help you become proficient in citation.

Understanding the Basics of Quoting

Proficiency in the fundamentals of quoting is integral to scholarly writing . This proficiency encompasses the ability to distinguish between primary and secondary sources and the skill of sourcing quotations.

Primary Source Vs. Secondary Source

Before discussing our journey of quoting sources, it’s crucial to distinguish between primary and secondary sources.

Primary Source 

A primary source is direct, firsthand information or an original work. Examples include original research papers, letters, diaries, speeches, and interviews.

Secondary Source 

On the other hand, a secondary source interprets, analyses, or summarises primary sources. It provides commentary or analysis based on primary sources. Examples include books, articles, documentaries, or reviews.

In most cases, it’s preferable to quote from primary sources as they offer the most direct and credible information.

How to Find a Quote Source

Finding the right source to quote is the first step in the quoting process. Here are some tips on how to locate suitable sources:

Online Databases and Libraries

Utilise online databases and library resources like PubMed, JSTOR, Google Scholar, and your university library’s website. These platforms provide access to a vast collection of scholarly materials.

Credible Websites

When searching online, focus on credible websites, such as government agencies, academic institutions, and well-established news outlets. Check for the author’s credentials and the publication date to ensure reliability.

Books and Journals

Physical and digital books and academic journals are excellent sources for quotes. Libraries and digital libraries like Project Gutenberg and the Library of Congress offer extensive collections.

Interviews and Personal Communications

If quoting from an interview or personal communication, ensure you have proper consent from the source. Use these quotes sparingly and only when they add unique value to your work.

How to Quote Sources in a Research Paper

Now that we have laid the foundation, let us explore the specifics of quoting within a research paper.

Inline Quotations

Inline quotations are short snippets of text integrated into your writing. 

Here’s how to format them correctly:

• Use Quotation Marks: Enclose the quoted text in double quotation marks.
• Include Page Numbers: If available, add the page number in parentheses after the quotation.
• Credit the Source: Mention the author’s name and the publication date within or after the quotation.

According to Smith (2020), “Quoting sources properly enhances the credibility of your research” (p. 45).

Block Quoting

When a quote exceeds 40 words or more, it should be formatted as a block quote.  

Follow these guidelines:

• Indentation: Indent the entire quote from the left margin, typically by 0.5 inches.
• Omit Quotation Marks: Block quotes do not require double quotation marks.
• Maintain Spacing: Keep the spacing consistent with the original text.
• Cite Source: Include the author’s name and publication date either before or after the block quote .

Example: Markdown

Smith (2020) highlighted the importance of proper quoting:

    Quoting sources properly enhances the credibility of your research. It shows that you have conducted thorough research and are building upon established knowledge. (p. 45)

Verifying Quotes

In quotes, especially when dealing with secondary sources that include quotes, it’s wise to verify the accuracy of the quoted material. Take the extra step to go back to the original source to ensure that the quote is complete, accurate, and not taken out of context. This diligence is essential for maintaining the integrity of your work.

Using Ellipses and Square Brackets

Quoting often involves adapting source material to fit within your narrative. When omitting words or phrases from a quote, use ellipses (…) to indicate the omission. When adding clarifications or explanations within a quote, enclose them in square brackets [].

These tools allow you to maintain the integrity of the original quote while ensuring it fits smoothly into your text.

Quoting a Source in An Essay

Quoting within an essay follows similar principles to research papers, with minor differences.

Signal Phrases

Signal phrases are used to introduce quotes in your essay. They provide context and indicate that you are incorporating someone else’s ideas. Examples of signal phrases include:

• According to…
• Smith argues that…
• In the words of…

Using signal phrases helps smoothly integrate quotes into your essay’s narrative.

Paraphrasing

While quoting is a valuable skill, it’s worth noting that paraphrasing—expressing someone else’s ideas in your own words—is another essential technique in writing. Paraphrasing allows you to integrate source material smoothly into your text while giving proper credit. When quoting is not necessary, consider paraphrasing as a viable alternative.

How to Cite a Quote: Harvard Style

Citing quotes correctly is crucial to avoiding plagiarism and giving credit to the original source. The Harvard referencing style is one commonly used for citing sources. Here’s how to cite a quote in Harvard style:

In-Text Citation

In-text citations should include the author’s last name, the publication year, and the page number (if applicable) within parentheses. Place this citation immediately after the quote or paraphrased content.

Example: (Smith, 2020, p. 45)

Reference List

In your reference list or bibliography, provide a full citation for each source you’ve quoted or referenced. The Harvard format typically includes the author’s name, publication year, title of the work, publisher, and other relevant information.

Example: scss

Smith, J. (2020). The Art of Quoting. Academic Press.

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Common Mistakes to Avoid when Quoting Sources

Even knowing how to quote sources effectively, it’s easy to make mistakes. Being aware of common pitfalls can help you avoid them. Here are some mistakes to watch out for:

1. Over-Quoting

Quoting should enhance your work, not dominate it. Avoid the temptation to fill your paper with lengthy quotes. Instead, use quotes selectively to support your arguments or provide evidence.

2. Improper Citation

Only accurate or consistent citations can lead to clarity and allegations of plagiarism. Make sure your in-text citations and reference list entries match the citation style required (e.g., Harvard, APA, MLA) and follow the prescribed format.

3. Lack of Context

Quotes should never stand alone; they should fit seamlessly into your narrative. Provide context by introducing the quote, explaining its relevance, and connecting it to your main argument.

4. Not Verifying Quotes

Refrain from relying on secondary sources that misquote or take original quotes out of context can lead to inaccuracies. Always verify quotes fromprimary sources w henever possible.

5. Overlooking Proofreading

Typos, missing punctuation, or formatting errors can detract from the professionalism of your work. Proofread your quotes, citations, and the surrounding text carefully.

Best Practices for Quoting

To ensure your quoting is impeccable, consider these best practices:

• Always attribute quotes to their respective authors.
• Ensure that the quotes you select are relevant and enhance your work’s context.
• Use quotes sparingly, with your voice and analysis dominating the text.
• Double-check the formatting style required by your institution or publication for consistency.
• Proofread to ensure accuracy in quotation marks, citations, and source details.

Online Tools and Resources For Quoting

Consider using online tools and resources to simplify the quoting process and ensure accuracy. Here are a few valuable options:

1. Citation Management Tools

• Zotero: A free, open-source tool that helps you collect, organise, cite, and share research materials.
• EndNote: A reference management program that offers advanced features for organising and citing sources..

2. Online Style Guides

• Purdue OWL: An online writing lab by Purdue University that provides extensive style guides for APA, MLA, Chicago, and more.
• CiteULike: A free service that helps you create and manage citations in various styles.
• Citation Machine: An easy-to-use tool for generating citations in APA, MLA, Chicago, and other styles.

3. Plagiarism Checkers

• Turnitin: A widely used plagiarism detection tool that helps you ensure the originality of your work.
• Grammarly: Besides grammar and spelling checks, Grammarly also offers a plagiarism checker for academic writing.

Integrating these tools and resources into your quoting process allows you to streamline your work and reduce the risk of errors in citations and quotations.

In conclusion, quoting sources is an integral part of academic and professional writing. Understanding the nuances of quoting, finding credible sources, and citing them correctly will elevate the quality of your work. Always prioritise accuracy, attribution, and context when incorporating quotes into your writing.

By following the guidelines and examples provided in this comprehensive guide, you’ll master quoting and enhancing the credibility of your research, essays, and papers. Remember that quoting is not just about using someone else’s words; it’s about building upon the knowledge of others while giving credit where it’s due.

Frequently Asked Questions

How to quote sources in a research paper.

To quote sources in a research paper, use double quotation marks, include an in-text citation with the author’s name and publication year, and integrate the quote smoothly into your text.

How to Cite a Quote?

To cite a quote, provide an in-text citation with the author’s name, publication year, and page number (if applicable), and include a full citation in your reference list following the required citation style.

What Are the Key Differences Between Primary and Secondary Sources in Quoting?

In the context of quoting, primary sources are firsthand accounts or original works, while secondary sources interpret or analyze primary sources. Explain the significance of these distinctions and their impact on effective quoting practices.

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Academic sources, also known as scholarly sources or academic references, are materials used by researchers, scholars, and students to support their academic work. These sources are specifically created for use in academic contexts and contribute to the body of knowledge in a particular field of study.

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• How to Quote | Citing Quotes in Harvard & APA

How to Quote | Citing Quotes in Harvard & APA

Published on 15 April 2022 by Shona McCombes and Jack Caulfield. Revised on 3 September 2022.

Quoting means copying a passage of someone else’s words and crediting the source. To quote a source, you must ensure:

• The quoted text is enclosed in quotation marks (usually single quotation marks in UK English, though double is acceptable as long as you’re consistent) or formatted as a block quote
• The original author is correctly cited
• The text is identical to the original

The exact format of a quote depends on its length and on which citation style you are using. Quoting and citing correctly is essential to avoid plagiarism , which is easy to detect with a good plagiarism checker .

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Table of contents

How to cite a quote in harvard and apa style, introducing quotes, quotes within quotes, shortening or altering a quote, block quotes, when should i use quotes, frequently asked questions about quoting sources.

Every time you quote, you must cite the source correctly . This looks slightly different depending on the citation style you’re using.

Citing a quote in Harvard style

When you include a quote in Harvard style, you must add a Harvard in-text citation giving the author’s last name, the year of publication, and a page number if available. Any full stop or comma appears after the citation, not within the quotation marks.

Citations can be parenthetical or narrative. In a parenthetical citation , you place all the information in brackets after the quote. In a narrative citation , you name the author in your sentence (followed by the year), and place the page number after the quote.

• Evolution is a gradual process that ‘can act only by very short and slow steps’ (Darwin, 1859, p. 510) . Darwin (1859) explains that evolution ‘can act only by very short and slow steps’ (p. 510) .

Complete guide to Harvard style

Citing a quote in APA Style

To cite a direct quote in APA , you must include the author’s last name, the year, and a page number, all separated by commas. If the quote appears on a single page, use ‘p.’; if it spans a page range, use ‘pp.’

An APA in-text citation can be parenthetical or narrative. In a parenthetical citation , you place all the information in parentheses after the quote. In a narrative citation , you name the author in your sentence (followed by the year), and place the page number after the quote.

Punctuation marks such as full stops and commas are placed after the citation, not within the quotation marks.

• Evolution is a gradual process that ‘can act only by very short and slow steps’ (Darwin, 1859, p. 510) .
• Darwin (1859) explains that evolution ‘can act only by very short and slow steps’ (p. 510) .

Complete guide to APA

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Make sure you integrate quotes properly into your text by introducing them in your own words, showing the reader why you’re including the quote and providing any context necessary to understand it.  Don’t  present quotations as stand-alone sentences.

There are three main strategies you can use to introduce quotes in a grammatically correct way:

• Add an introductory sentence
• Use an introductory signal phrase
• Integrate the quote into your own sentence

The following examples use APA Style citations, but these strategies can be used in all styles.

Introductory sentence

Introduce the quote with a full sentence ending in a colon . Don’t use a colon if the text before the quote isn’t a full sentence.

If you name the author in your sentence, you may use present-tense verbs, such as “states’, ‘argues’, ‘explains’, ‘writes’, or ‘reports’, to describe the content of the quote.

• In Denmark, a recent poll shows that: ‘A membership referendum held today would be backed by 55 percent of Danish voters’ (Levring, 2018, p. 3).
• In Denmark, a recent poll shows that support for the EU has grown since the Brexit vote: ‘A membership referendum held today would be backed by 55 percent of Danish voters’ (Levring, 2018, p. 3).
• Levring (2018) reports that support for the EU has grown since the Brexit vote: ‘A membership referendum held today would be backed by 55 percent of Danish voters’ (p. 3).

Introductory signal phrase

You can also use a signal phrase that mentions the author or source but doesn’t form a full sentence. In this case, you follow the phrase with a comma instead of a colon.

• According to a recent poll, ‘A membership referendum held today would be backed by 55 percent of Danish voters’ (Levring, 2018, p. 3).
• As Levring (2018) explains, ‘A membership referendum held today would be backed by 55 percent of Danish voters’ (p. 3).

Integrated into your own sentence

To quote a phrase that doesn’t form a full sentence, you can also integrate it as part of your sentence, without any extra punctuation.

• A recent poll suggests that EU membership ‘would be backed by 55 percent of Danish voters’ in a referendum (Levring, 2018, p. 3).
• Levring (2018) reports that EU membership ‘would be backed by 55 percent of Danish voters’ in a referendum (p. 3).

When you quote text that itself contains another quote, this is called a nested quotation or a quote within a quote. It may occur, for example, when quoting dialogue from a novel.

To distinguish this quote from the surrounding quote, you enclose it in double (instead of single) quotation marks (even if this involves changing the punctuation from the original text). Make sure to close both sets of quotation marks at the appropriate moments.

Note that if you only quote the nested quotation itself, and not the surrounding text, you can just use single quotation marks.

• Carraway introduces his narrative by quoting his father: ‘ ‘ Whenever you feel like criticizing anyone, ‘ he told me, ‘ just remember that all the people in this world haven’t had the advantages that you’ve had ‘ ‘ (Fitzgerald 1).
• Carraway introduces his narrative by quoting his father: ‘”Whenever you feel like criticizing anyone,” he told me, “just remember that all the people in this world haven’t had the advantages that you’ve had “  (Fitzgerald 1).
• Carraway introduces his narrative by quoting his father: ‘“Whenever you feel like criticizing anyone,” he told me, “just remember that all the people in this world haven’t had the advantages that you’ve had”’ (Fitzgerald 1).
• Carraway begins by quoting his father’s invocation to ‘remember that all the people in this world haven’t had the advantages that you’ve had’ (Fitzgerald 1).

Note:  When the quoted text in the source comes from another source, it’s best to just find that original source in order to quote it directly. If you can’t find the original source, you can instead cite it indirectly .

Often, incorporating a quote smoothly into your text requires you to make some changes to the original text. It’s fine to do this, as long as you clearly mark the changes you’ve made to the quote.

Shortening a quote

If some parts of a passage are redundant or irrelevant, you can shorten the quote by removing words, phrases, or sentences and replacing them with an ellipsis (…). Put a space before and after the ellipsis.

Be careful that removing the words doesn’t change the meaning. The ellipsis indicates that some text has been removed, but the shortened quote should still accurately represent the author’s point.

Altering a quote

You can add or replace words in a quote when necessary. This might be because the original text doesn’t fit grammatically with your sentence (e.g., it’s in a different tense), or because extra information is needed to clarify the quote’s meaning.

Use brackets to distinguish words that you have added from words that were present in the original text.

The Latin term ‘ sic ‘ is used to indicate a (factual or grammatical) mistake in a quotation. It shows the reader that the mistake is from the quoted material, not a typo of your own.

In some cases, it can be useful to italicise part of a quotation to add emphasis, showing the reader that this is the key part to pay attention to. Use the phrase ’emphasis added’ to show that the italics were not part of the original text.

You usually don’t need to use brackets to indicate minor changes to punctuation or capitalisation made to ensure the quote fits the style of your text.

If you quote more than a few lines from a source, you must format it as a block quote . Instead of using quotation marks, you set the quote on a new line and indent it so that it forms a separate block of text.

Block quotes are cited just like regular quotes, except that if the quote ends with a full stop, the citation appears after the full stop.

To the end of his days Bilbo could never remember how he found himself outside, without a hat, a walking-stick or any money, or anything that he usually took when he went out; leaving his second breakfast half-finished and quite unwashed-up, pushing his keys into Gandalf’s hands, and running as fast as his furry feet could carry him down the lane, past the great Mill, across The Water, and then on for a mile or more. (16)

Avoid relying too heavily on quotes in academic writing . To integrate a source , it’s often best to paraphrase , which means putting the passage into your own words. This helps you integrate information smoothly and keeps your own voice dominant.

However, there are some situations in which quotes are more appropriate.

When focusing on language

If you want to comment on how the author uses language (for example, in literary analysis ), it’s necessary to quote so that the reader can see the exact passage you are referring to.

When giving evidence

To convince the reader of your argument, interpretation or position on a topic, it’s often helpful to include quotes that support your point. Quotes from primary sources (for example, interview transcripts or historical documents) are especially credible as evidence.

When presenting an author’s position or definition

When you’re referring to secondary sources such as scholarly books and journal articles, try to put others’ ideas in your own words when possible.

But if a passage does a great job at expressing, explaining, or defining something, and it would be very difficult to paraphrase without changing the meaning or losing the weakening the idea’s impact, it’s worth quoting directly.

A quote is an exact copy of someone else’s words, usually enclosed in quotation marks and credited to the original author or speaker.

To present information from other sources in academic writing , it’s best to paraphrase in most cases. This shows that you’ve understood the ideas you’re discussing and incorporates them into your text smoothly.

It’s appropriate to quote when:

• Changing the phrasing would distort the meaning of the original text
• You want to discuss the author’s language choices (e.g., in literary analysis )
• You’re presenting a precise definition
• You’re looking in depth at a specific claim

Every time you quote a source , you must include a correctly formatted in-text citation . This looks slightly different depending on the citation style .

For example, a direct quote in APA is cited like this: ‘This is a quote’ (Streefkerk, 2020, p. 5).

Every in-text citation should also correspond to a full reference at the end of your paper.

In scientific subjects, the information itself is more important than how it was expressed, so quoting should generally be kept to a minimum. In the arts and humanities, however, well-chosen quotes are often essential to a good paper.

In social sciences, it varies. If your research is mainly quantitative , you won’t include many quotes, but if it’s more qualitative , you may need to quote from the data you collected .

As a general guideline, quotes should take up no more than 5–10% of your paper. If in doubt, check with your instructor or supervisor how much quoting is appropriate in your field.

If you’re quoting from a text that paraphrases or summarises other sources and cites them in parentheses , APA recommends retaining the citations as part of the quote:

• Smith states that ‘the literature on this topic (Jones, 2015; Sill, 2019; Paulson, 2020) shows no clear consensus’ (Smith, 2019, p. 4).

Footnote or endnote numbers that appear within quoted text should be omitted.

If you want to cite an indirect source (one you’ve only seen quoted in another source), either locate the original source or use the phrase ‘as cited in’ in your citation.

A block quote is a long quote formatted as a separate ‘block’ of text. Instead of using quotation marks , you place the quote on a new line, and indent the entire quote to mark it apart from your own words.

APA uses block quotes for quotes that are 40 words or longer.

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If you want to cite this source, you can copy and paste the citation or click the ‘Cite this Scribbr article’ button to automatically add the citation to our free Reference Generator.

McCombes, S. & Caulfield, J. (2022, September 03). How to Quote | Citing Quotes in Harvard & APA. Scribbr. Retrieved 21 August 2024, from https://www.scribbr.co.uk/working-sources/quoting/

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How to Cite Sources

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Direct Quotes, Summaries & Paraphrases (adapted from Butler University Libraries)

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• Direct Quotes
• Common Knowledge

YOU SHOULD CITE WHEN:

• Referring to a source and stating someone else's opinions, thoughts, ideas, or research
• Using an image or media file that you did not create

WHEN REFERRING TO A SOURCE, YOU HAVE THREE OPTIONS FOR USING IT:

• Directly Quoting 
• Summarizing 
• Paraphrase 

"Which option you should choose depends on how much of a source you are using, how you are using it, and what kind of paper you are writing, since different fields use sources in different ways." Grounds for Argument.  When to Quote, Paraphrase, or Summarize a Source . Used under CC BY NC SA

Image:   Random quote  by  Gabriel Jones . Used under  CC BY-NC-SA 2.0

YOU DO NOT NEED TO CITE:

• Your thoughts and your interpretations
• Common knowledge​

WHAT IS A DIRECT QUOTATION:  

"Must be identical to the original, using a narrow segment of the source. They must match the source document word for word and must be attributed to the original author."   Purdue University Online Writing Lab. (2012).  Quoting, Paraphrasing, and Summarizing

• If summarizing or paraphrasing cannot capture the essence or meaning of the text 
• To retain a specific or unique phrasing used by the source's author
• If you are analyzing the text itself (often in English or language classes)

BE ADVISED:

Most of the time when you cite a source, you want to summarize or paraphrase. Direct quotations should be used sparingly when the situation meets the criteria above. When you do use direct quotations:

• Do not take the quote out of context. The author's meaning should not change.
• Be sure to integrate multiple sources within your text. You don't want to have a paper or a passage that seems to have come only from one source, with little original text from you.
• Use transitions to make sure your quote adds to your paper without interrupting its flow.

HOW TO CITE A DIRECT QUOTATION:   

• Place  quotation marks  around the entire word-for-word passage, whether it's a phrase or a sentence.
• Attribute with an  in-text citation ; most citation styles request that you provide a  page or paragraph number  when directly citing.  
• If your quotation is longer, check with your citation style guide to see if additional formatting is necessary (block quotations, for example).
• When and How Much to Quote (Harvard Guide to Using Sources)

WHAT IS A SUMMARY:  

"Involves putting the main idea(s) into your own words, including only the main point(s).... Summaries are significantly shorter than the original and take a broad overview of the source material."   Purdue University Online Writing Lab. (2012).  Quoting, Paraphrasing, and Summarizing

"Similar to paraphrasing, summarizing involves using your own words and writing style to express another author's ideas. Unlike the paraphrase, which presents important details, the summary presents only the most important ideas of the passage." University of Houston-Victoria Student Success Center (n.d.).  Decide when to Quote, Paraphrase & Summarize.

• To provide necessary background information for your audience
• When broad, concise information will suffice 

HOW TO CITE A SUMMARY:  

• Attribute with an in-text citation; some citation styles request that you provide a page or paragraph number whenever available.
• You should not be using any word-for-word quotations or language unique to the source, so you do NOT need quotation marks around your summary.

WHAT IS A PARAPHRASE:  

"A paraphrase is a detailed restatement in your own words of a written or sometimes spoken source material. Apart from the changes in organization, wording, and sentence structure, the paraphrase should be nearly identical in meaning to the original passage. It should also be near the same length as the original passage and present the details of the original." University of Houston-Victoria Student Success Center (n.d.).  Decide when to Quote, Paraphrase & Summarize.

Paraphrasing is "your own rendition of essential information and ideas expressed by someone else, presented in a new form."  Purdue University Online Writing Lab. (2012).   Quoting, Paraphrasing, and Summarizing

• "When the wording is less important than the meaning of the source" University of Houston-Victoria Student Success Center (n.d.).  Decide when to Quote, Paraphrase & Summarize.
• If a summary would not provide enough specific details

HOW TO CITE A PARAPHRASE:  

• When paraphrasing, you must change both the sentence structure and language of the original text.  Therefore, since you will be changing the text, you do NOT need quotation marks around your paraphrase.

Includes 6 steps to effective paraphrasing and examples.

From the Harvard Guide to Using Sources

It doesn't necessarily mean that most people would know it offhand. And sometimes it's a judgment call because what seems like common knowledge to one person isn't to another. Here are good guidelines: 

• If you can find the same information in multiple places, stated in relatively the same way, it's common knowledge  (Generally, it is said that you should find the information three to five sources)
• If most people are aware of this fact, or if it's general reference, it's common knowledge

CAUTION:  Opinions and unique terminology/phrasing do not qualify as common knowledge.

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Home / Guides / Citation Guides / How to Cite Sources

How to Cite Sources

Here is a complete list for how to cite sources. Most of these guides present citation guidance and examples in MLA, APA, and Chicago.

If you’re looking for general information on MLA or APA citations , the EasyBib Writing Center was designed for you! It has articles on what’s needed in an MLA in-text citation , how to format an APA paper, what an MLA annotated bibliography is, making an MLA works cited page, and much more!

MLA Format Citation Examples

The Modern Language Association created the MLA Style, currently in its 9th edition, to provide researchers with guidelines for writing and documenting scholarly borrowings.  Most often used in the humanities, MLA style (or MLA format ) has been adopted and used by numerous other disciplines, in multiple parts of the world.

MLA provides standard rules to follow so that most research papers are formatted in a similar manner. This makes it easier for readers to comprehend the information. The MLA in-text citation guidelines, MLA works cited standards, and MLA annotated bibliography instructions provide scholars with the information they need to properly cite sources in their research papers, articles, and assignments.

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APA Format Citation Examples

The American Psychological Association created the APA citation style in 1929 as a way to help psychologists, anthropologists, and even business managers establish one common way to cite sources and present content.

APA is used when citing sources for academic articles such as journals, and is intended to help readers better comprehend content, and to avoid language bias wherever possible. The APA style (or APA format ) is now in its 7th edition, and provides citation style guides for virtually any type of resource.

Chicago Style Citation Examples

The Chicago/Turabian style of citing sources is generally used when citing sources for humanities papers, and is best known for its requirement that writers place bibliographic citations at the bottom of a page (in Chicago-format footnotes ) or at the end of a paper (endnotes).

The Turabian and Chicago citation styles are almost identical, but the Turabian style is geared towards student published papers such as theses and dissertations, while the Chicago style provides guidelines for all types of publications. This is why you’ll commonly see Chicago style and Turabian style presented together. The Chicago Manual of Style is currently in its 17th edition, and Turabian’s A Manual for Writers of Research Papers, Theses, and Dissertations is in its 8th edition.

Citing Specific Sources or Events

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Additional FAQs

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6 Interesting Citation Facts

The world of citations may seem cut and dry, but there’s more to them than just specific capitalization rules, MLA in-text citations , and other formatting specifications. Citations have been helping researches document their sources for hundreds of years, and are a great way to learn more about a particular subject area.

Ever wonder what sets all the different styles apart, or how they came to be in the first place? Read on for some interesting facts about citations!

1. There are Over 7,000 Different Citation Styles

You may be familiar with MLA and APA citation styles, but there are actually thousands of citation styles used for all different academic disciplines all across the world. Deciding which one to use can be difficult, so be sure to ask you instructor which one you should be using for your next paper.

2. Some Citation Styles are Named After People

While a majority of citation styles are named for the specific organizations that publish them (i.e. APA is published by the American Psychological Association, and MLA format is named for the Modern Language Association), some are actually named after individuals. The most well-known example of this is perhaps Turabian style, named for Kate L. Turabian, an American educator and writer. She developed this style as a condensed version of the Chicago Manual of Style in order to present a more concise set of rules to students.

3. There are Some Really Specific and Uniquely Named Citation Styles

How specific can citation styles get? The answer is very. For example, the “Flavour and Fragrance Journal” style is based on a bimonthly, peer-reviewed scientific journal published since 1985 by John Wiley & Sons. It publishes original research articles, reviews and special reports on all aspects of flavor and fragrance. Another example is “Nordic Pulp and Paper Research,” a style used by an international scientific magazine covering science and technology for the areas of wood or bio-mass constituents.

4. More citations were created on  EasyBib.com  in the first quarter of 2018 than there are people in California.

The US Census Bureau estimates that approximately 39.5 million people live in the state of California. Meanwhile, about 43 million citations were made on EasyBib from January to March of 2018. That’s a lot of citations.

5. “Citations” is a Word With a Long History

The word “citations” can be traced back literally thousands of years to the Latin word “citare” meaning “to summon, urge, call; put in sudden motion, call forward; rouse, excite.” The word then took on its more modern meaning and relevance to writing papers in the 1600s, where it became known as the “act of citing or quoting a passage from a book, etc.”

6. Citation Styles are Always Changing

The concept of citations always stays the same. It is a means of preventing plagiarism and demonstrating where you relied on outside sources. The specific style rules, however, can and do change regularly. For example, in 2018 alone, 46 new citation styles were introduced , and 106 updates were made to exiting styles. At EasyBib, we are always on the lookout for ways to improve our styles and opportunities to add new ones to our list.

Why Citations Matter

Here are the ways accurate citations can help your students achieve academic success, and how you can answer the dreaded question, “why should I cite my sources?”

They Give Credit to the Right People

Citing their sources makes sure that the reader can differentiate the student’s original thoughts from those of other researchers. Not only does this make sure that the sources they use receive proper credit for their work, it ensures that the student receives deserved recognition for their unique contributions to the topic. Whether the student is citing in MLA format , APA format , or any other style, citations serve as a natural way to place a student’s work in the broader context of the subject area, and serve as an easy way to gauge their commitment to the project.

They Provide Hard Evidence of Ideas

Having many citations from a wide variety of sources related to their idea means that the student is working on a well-researched and respected subject. Citing sources that back up their claim creates room for fact-checking and further research . And, if they can cite a few sources that have the converse opinion or idea, and then demonstrate to the reader why they believe that that viewpoint is wrong by again citing credible sources, the student is well on their way to winning over the reader and cementing their point of view.

They Promote Originality and Prevent Plagiarism

The point of research projects is not to regurgitate information that can already be found elsewhere. We have Google for that! What the student’s project should aim to do is promote an original idea or a spin on an existing idea, and use reliable sources to promote that idea. Copying or directly referencing a source without proper citation can lead to not only a poor grade, but accusations of academic dishonesty. By citing their sources regularly and accurately, students can easily avoid the trap of plagiarism , and promote further research on their topic.

They Create Better Researchers

By researching sources to back up and promote their ideas, students are becoming better researchers without even knowing it! Each time a new source is read or researched, the student is becoming more engaged with the project and is developing a deeper understanding of the subject area. Proper citations demonstrate a breadth of the student’s reading and dedication to the project itself. By creating citations, students are compelled to make connections between their sources and discern research patterns. Each time they complete this process, they are helping themselves become better researchers and writers overall.

When is the Right Time to Start Making Citations?

Make in-text/parenthetical citations as you need them.

As you are writing your paper, be sure to include references within the text that correspond with references in a works cited or bibliography. These are usually called in-text citations or parenthetical citations in MLA and APA formats. The most effective time to complete these is directly after you have made your reference to another source. For instance, after writing the line from Charles Dickens’ A Tale of Two Cities : “It was the best of times, it was the worst of times…,” you would include a citation like this (depending on your chosen citation style):

(Dickens 11).

This signals to the reader that you have referenced an outside source. What’s great about this system is that the in-text citations serve as a natural list for all of the citations you have made in your paper, which will make completing the works cited page a whole lot easier. After you are done writing, all that will be left for you to do is scan your paper for these references, and then build a works cited page that includes a citation for each one.

Need help creating an MLA works cited page ? Try the MLA format generator on EasyBib.com! We also have a guide on how to format an APA reference page .

2. Understand the General Formatting Rules of Your Citation Style Before You Start Writing

While reading up on paper formatting may not sound exciting, being aware of how your paper should look early on in the paper writing process is super important. Citation styles can dictate more than just the appearance of the citations themselves, but rather can impact the layout of your paper as a whole, with specific guidelines concerning margin width, title treatment, and even font size and spacing. Knowing how to organize your paper before you start writing will ensure that you do not receive a low grade for something as trivial as forgetting a hanging indent.

Don’t know where to start? Here’s a formatting guide on APA format .

3. Double-check All of Your Outside Sources for Relevance and Trustworthiness First

Collecting outside sources that support your research and specific topic is a critical step in writing an effective paper. But before you run to the library and grab the first 20 books you can lay your hands on, keep in mind that selecting a source to include in your paper should not be taken lightly. Before you proceed with using it to backup your ideas, run a quick Internet search for it and see if other scholars in your field have written about it as well. Check to see if there are book reviews about it or peer accolades. If you spot something that seems off to you, you may want to consider leaving it out of your work. Doing this before your start making citations can save you a ton of time in the long run.

Finished with your paper? It may be time to run it through a grammar and plagiarism checker , like the one offered by EasyBib Plus. If you’re just looking to brush up on the basics, our grammar guides  are ready anytime you are.

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MLA Formatting Quotations

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When you directly quote the works of others in your paper, you will format quotations differently depending on their length. Below are some basic guidelines for incorporating quotations into your paper. Please note that all pages in MLA should be double-spaced .

Short quotations

To indicate short quotations (four typed lines or fewer of prose or three lines of verse) in your text, enclose the quotation within double quotation marks. Provide the author and specific page number (in the case of verse, provide line numbers) in the in-text citation, and include a complete reference on the Works Cited page. Punctuation marks such as periods, commas, and semicolons should appear after the parenthetical citation.

Question marks and exclamation points should appear within the quotation marks if they are a part of the quoted passage, but after the parenthetical citation if they are a part of your text.

For example, when quoting short passages of prose, use the following examples:

When using short (fewer than three lines of verse) quotations from poetry, mark breaks in verse with a slash, ( / ), at the end of each line of verse (a space should precede and follow the slash). If a stanza break occurs during the quotation, use a double slash ( // ).

Long quotations

For quotations that are more than four lines of prose or three lines of verse, place quotations in a free-standing block of text and omit quotation marks. Start the quotation on a new line, with the entire quote indented 1/2   inch  from the left margin while maintaining double-spacing. Your parenthetical citation should come  after the closing punctuation mark . When quoting verse, maintain original line breaks. (You should maintain double-spacing throughout your essay.)

For example, when citing more than four lines of prose, use the following examples :

Nelly Dean treats Heathcliff poorly and dehumanizes him throughout her narration: They entirely refused to have it in bed with them, or even in their room, and I had no more sense, so, I put it on the landing of the stairs, hoping it would be gone on the morrow. By chance, or else attracted by hearing his voice, it crept to Mr. Earnshaw's door, and there he found it on quitting his chamber. Inquiries were made as to how it got there; I was obliged to confess, and in recompense for my cowardice and inhumanity was sent out of the house. (Bronte 78)

When citing long sections of poetry (four lines of verse or more), keep formatting as close to the original as possible.

In his poem "My Papa's Waltz," Theodore Roethke explores his childhood with his father:

The whiskey on your breath Could make a small boy dizzy; But I hung on like death: Such waltzing was not easy. We Romped until the pans Slid from the kitchen shelf; My mother's countenance Could not unfrown itself. (qtd. in Shrodes, Finestone, Shugrue 202)

When citing two or more paragraphs, use block quotation format, even if the passage from the paragraphs is less than four lines. If you cite more than one paragraph, the first line of the second paragraph should be indented an extra 1/4 inch to denote a new paragraph:

In "American Origins of the Writing-across-the-Curriculum Movement," David Russell argues,

Writing has been an issue in American secondary and higher education since papers and examinations came into wide use in the 1870s, eventually driving out formal recitation and oral examination. . . .

From its birth in the late nineteenth century, progressive education has wrestled with the conflict within industrial society between pressure to increase specialization of knowledge and of professional work (upholding disciplinary standards) and pressure to integrate more fully an ever-widening number of citizens into intellectually meaningful activity within mass society (promoting social equity). . . . (3)

Adding or omitting words in quotations

If you add a word or words in a quotation, you should put brackets around the words to indicate that they are not part of the original text:

If you omit a word or words from a quotation, you should indicate the deleted word or words by using ellipses, which are three periods ( . . . ) preceded and followed by a space. For example:

Please note that brackets are not needed around ellipses unless they would add clarity.

When omitting words from poetry quotations, use a standard three-period ellipses; however, when omitting one or more full lines of poetry, space several periods to about the length of a complete line in the poem:

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In APA style, you use parenthetical citations within the text of your paper to credit your sources, to show how recently your sources were published, and to refer your reader to a more detailed citation of the source in the reference list at the end of your paper. You should use parenthetical citations when you paraphrase, quote, or make any reference to another author's work. A parenthetical citation in APA style includes the author's last name as well as the year in which the work was published, with a comma between them. If you are referring directly to a specific page in the source, you should also include the page number in your parenthetical citation. APA requires you to cite page numbers when you are quoting directly from the source. If you are paraphrasing, which is more common in the social sciences, you generally do not need to include a page number. If you have questions about whether you should include page numbers when citing in APA, you should consult your instructor.

If you mention the author's name and/or the year of publication in the sentence preceding the citation, you do not need to include them in the parenthetical citation. When you name the author in the sentence, you should include the publication year in parentheses right after the author’s name—do not wait until the end of the sentence to provide that information.

When you include a parenthetical citation at the end of a sentence, the punctuation for your sentence appears after the citation.

Citing author and date in a parenthetical citation

When you don’t mention either the author or the date of publication in your sentence, you should include both the author and the year, separated by a comma, in the parenthetical citation. 

Colleges and universities need to create policies that foster inclusion for low-income students (Jack, 2019).         

Citing when author’s name is mentioned in body of paper

When you mention the author’s name in your sentence, the year of publication should immediately follow the author’s name.

Anthony Jack’s (2019) study of low-income students on an elite college campus revealed that these schools are often unprepared to support the students they admit.

Jack (2019) studied the ways low-income students experience elite college campuses.

Citing page numbers

When you cite a direct quote from the source or paraphrase a specific point from the source, you should include the page number in the parenthetical citation at the end of the sentence. When you refer to a specific page or pages of the text, first list the year of publication and then list "p." followed by the page number or "pp." followed by the range of pages. If you refer to a specific chapter, indicate that chapter after the year.              

The author contends that “higher education in America is highly unequal and disturbingly stratified” (Jack, 2019, p. 4).

Jack (2019) contends that “higher education in America is highly unequal and disturbingly stratified” (p. 4).

Citing sources with more than one author

When you cite a source that has two authors, you should separate their names with an ampersand in the parenthetical citation.

The authors designed a study to determine if social belonging can be encouraged among college students (Walton & Cohen, 2011). 

If a work has three or more authors , you should only include the first author's name followed by et al. ( Et al. is the shortened form of the Latin et alia , which means “and others.”)

The implementation of postpartum contraceptive programs is both costly and time consuming (Ling et al., 2020).

Attributing a point to more than one source  

To attribute a point or idea to multiple sources, list them in one parenthetical citation, ordered alphabetically by author and separated by semicolons. Works by the same author should be ordered chronologically, from oldest to most recent, with the publication dates separated by commas.

Students who possess cultural capital, measured by proxies like involvement in literature, art, and classical music, tend to perform better in school (Bourdieu & Passeron, 1977; Dumais, 2002; Orr, 2003).

Citing multiple works by the same author 

If your reference list includes multiple works by the same author in the same year, identify them in your parenthetical citations and in your reference list by a lowercase letter after the year, assigning each letter in alphabetical order by the title of the work. When establishing the alphabetical order of works in your reference list, do not count the words "A" or "The" when they appear as the first word in a title.

One union-endorsed candidate publicly disagreed with the teachers' union on a number of issues (Borsuk, 1999a).

Citing multiple authors with the same last name        

If your reference list includes sources by multiple authors with the same last name, list each author's initials before their last name, even when the works were published in different years.

The question of whether a computer can be considered an author has been asked for longer than we might expect (B. Sobel, 2017).

Citing when no author is listed           

To refer to a work that is listed in your reference list by title rather than by author, cite the title or the first few words of the title.

The New York Times painted a bleak picture of the climate crisis (“Climate Change Is Not Negotiable,” 2022).

Citing when no date is listed

If the work you are citing has no date listed, you should put “n.d.” for “no date” in the parenthetical citation.

Writing research papers is challenging (Lam, n.d.). 

Citing a specific part of a source that is not a page number

To refer to a specific part of a source other than page number, add that after the author-date part of your citation. If it is not clear whether you are referring to a chapter, a paragraph, a time stamp, or a slide number, or other labeled part of a source, you should indicate the part you are referring to (chapter, para., etc.).

In the Stranger Things official trailer, the audience knows that something unusual is going to happen from the moment the boys get on their bicycles to ride off into the night (Duffer & Duffer, 0:16).

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• Examples of Commonly Cited Sources
• Frequently Asked Questions About Cite Sources in APA Format
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• Research Process
• Find Background Info
• Find Sources through the Library
• Evaluate Your Info
• Cite Your Sources
• Evaluate, Write & Cite

• is the right thing to do  to give credit to those who had the idea
• shows that you have read and understand  what experts have had to say about your topic
• helps people find the sources  that you used in case they want to read more about the topic
• provides   evidence  for your arguments
• is professional and  standard practice   for students and scholars

What is a Citation?

A citation identifies for the reader the original source for an idea, information, or image that is referred to in a work.

• In the body of a paper, the  in-text citation  acknowledges the source of information used.
• At the end of a paper, the citations are compiled on a  References  or  Works Cited  list. A basic citation includes the author, title, and publication information of the source. 

From:  Lemieux  Library,  University  of Seattle 

Why Should You Cite?

Quoting Are you quoting two or more consecutive words from a source? Then the original source should be cited and the words or phrase placed in quotes. 

Paraphrasing If an idea or information comes from another source,  even if you put it in your own words , you still need to credit the source.  General vs. Unfamiliar Knowledge You do not need to cite material which is accepted common knowledge. If in doubt whether your information is common knowledge or not, cite it. Formats We usually think of books and articles. However, if you use material from web sites, films, music, graphs, tables, etc. you'll also need to cite these as well.

Plagiarism is presenting the words or ideas of someone else as your own without proper acknowledgment of the source. When you work on a research paper and use supporting material from works by others, it's okay to quote people and use their ideas, but you do need to correctly credit them. Even when you summarize or paraphrase information found in books, articles, or Web pages, you must acknowledge the original author.

Citation Style Help

Helpful links:

• MLA ,  Works Cited : A Quick Guide (a template of core elements)
• CSE  (Council of Science Editors)

For additional writing resources specific to styles listed here visit the  Purdue OWL Writing Lab

Citation and Bibliography Resources

• How to Write an Annotated Bibliography
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• Next: Evaluate, Write & Cite >>

Creative Commons Attribution 3.0 License except where otherwise noted.

Land Acknowledgement

The land on which we gather is the unceded territory of the Awaswas-speaking Uypi Tribe. The Amah Mutsun Tribal Band, comprised of the descendants of indigenous people taken to missions Santa Cruz and San Juan Bautista during Spanish colonization of the Central Coast, is today working hard to restore traditional stewardship practices on these lands and heal from historical trauma.

The land acknowledgement used at UC Santa Cruz was developed in partnership with the Amah Mutsun Tribal Band Chairman and the Amah Mutsun Relearning Program at the UCSC Arboretum .

APA 7th Edition Citation Examples

• Volume and Issue Numbers
• Page Numbers
• Undated Sources
• Citing a Source Within a Source

Citing a Source within a Source

• In-Text Citations
• Academic Journals
• Encyclopedia Articles
• Book, Film, and Product Reviews
• Online Classroom Materials
• Conference Papers
• Technical + Research Reports
• Court Decisions
• Treaties and Other International Agreements
• Federal Regulations: I. The Code of Federal Regulations
• Federal Regulations: II. The Federal Register
• Executive Orders
• Charter of the United Nations
• Federal Statutes
• Dissertations and Theses
• Interviews, E-mail Messages + Other Personal Communications
• Social Media
• Business Sources
• PowerPoints
• AI: ChatGPT, etc.

Scenario: You read a 2007 article by Linhares and Brum that cites an earlier article, by Klein. You want to cite Klein's article, but you have not read Klein's article itself.

Reference list citation

Linhares, A., & Brum, P. (2007). Understanding our understanding of strategic scenarios: What role do chunks play? Cognitive Science , 31 (6), 989-1007. https://doi.org/10.1080/03640210701703725

Your Reference list will contain the article you read, by Linhares and Brum. Your Reference list will NOT contain a citation for Klein's article.

In-text citation

Klein's study (as cited in Linhares & Brum, 2007) found that...

Your in-text citation gives credit to Klein and shows the source in which you found Klein's ideas.

See  Publication Manual , p. 258.

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• Next: In-Text Citations >>
• Last Updated: Mar 18, 2024 12:55 PM
• URL: https://libguides.umgc.edu/apa-examples

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How to Cite a Quote

Last Updated: June 27, 2024 Fact Checked

This article was reviewed by Gerald Posner . Gerald Posner is an Author & Journalist based in Miami, Florida. With over 35 years of experience, he specializes in investigative journalism, nonfiction books, and editorials. He holds a law degree from UC College of the Law, San Francisco, and a BA in Political Science from the University of California-Berkeley. He’s the author of thirteen books, including several New York Times bestsellers, the winner of the Florida Book Award for General Nonfiction, and has been a finalist for the Pulitzer Prize in History. He was also shortlisted for the Best Business Book of 2020 by the Society for Advancing Business Editing and Writing. There are 18 references cited in this article, which can be found at the bottom of the page. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 1,270,623 times.

According to Webster's New Collegiate Dictionary, the word "plagiarize" can mean trying to pass off someone else's ideas, work or words as your own, or using those ideas, work or words without giving due credit to the source. You can avoid either misdeed by simply giving credit where credit is due. The three primary citation styles are APA, MLA, and CMS.

Sample Citations

Cite a Quote in APA Style

Example: Smith (2013) states that citing quotes can be challenging.

The author remarks on the "difficulty of citing quotes," (Smith, 2002, p. 32) but does not go into depth. or Smith (2002) mentions the "difficulty of citing quotes" (p. 32) but does not go into depth.

These scholars agree that "quotes are useful" (Hu, Koller, and Shier, 2013, p. 75). or Hu, Koller, and Shier agree that "quotes are useful" (p. 75).

In a study, it was determined that “the sky is in fact blue” (“Obvious Observations,” 2013).

Another study showed that “clouds are white” (“More Obvious Observations,” n.d., para. 7).

The message affirmed that “the sky is in fact blue” (John Smith, email, August 23, 2013).

Book with one or more authors: Lastname, First Initials (year published). Title of Book . Location: Publisher. Book with no author: [7] X Trustworthy Source APA Style Definitive source for current APA style writing and citation guidelines Go to source Title of Book. (Year). Location: Publisher. Web page: Lastname, First Initials (date of publication). Title of document. URL. If there is no date, write n.d. If there is no author, start with "Title. (date)." [8] X Research source

Cite a Quote in MLA Style

The meat factory workers of Chicago “were tied to the great packing-machine, and tied to it for life” (Sinclair, 99). or Upton Sinclair described the workers as "tied to the great packing-machine, and tied to it for life” (99).

Two or three authors The authors state, “citing quotes can be annoying” (Hu, Koller, and Shier 45). More than three authors: The authors state, “citing different sources can be confusing” (Perhamus et al. 63). [11] X Research source

Citing How to Cite Like a Champion and Be Better Than Other Writers : Citing sources can get annoying because “it can take a while” (Cite like a Champion 72).

The sky is blue but “clouds are white” (Obvious Observations Online).

An email message confirmed that “the sky is indeed blue” (Smith).

Book with one author: Lastname, Firstname. Title of Book . City of Publication: Publisher, Year of Publication. Medium of Publication. Note: The Medium of Publication is "Print" for paper books. Other media include Web and Radio. Book with multiple authors: Lastname, Firstname of first alphabetical author, then Firstname Lastname for other authors. Title of Book . City of Publication: Publisher, Year of Publication. Medium of Publication. Book with no known author: Title of publication . City of Publication: Publisher, Year of Publication. Medium of Publication. Web page: [16] X Trustworthy Source Purdue Online Writing Lab Trusted resource for writing and citation guidelines Go to source “Name of Article.” Name of Website. Name of website owner, date of publication. Web. Date of access. Note: Write n.d. if no publishing date is listed. Personal interview: Lastname, Firstname of interviewee. Personal interview. Date. Published interview: Lastname, Firstname of interviewee. Interview with (Name of Interviewer). Publication or program (year): page numbers if applicable. Medium of publication. Personal message: Lastname, Firstname of sender. “Title of Message.” Medium. Date.

Cite a Quote in CMS

The people who worked in the meat factories of Chicago at the turn of the century “were tied to the great packing-machine, and tied to it for life.” 1

1 Upton Sinclair, The Jungle (Doubleday, Page & Company: 1906), 99.

With an author: John Doe, “Citing Sources,” Organization of Writing Fanatics, last modified August 23, 2013, www.blahcitingblahblah.com Page without an author: “Citing Sources,” Organization of Writing Fanatics, last modified August 23, 2013, www.blahcitingblahblah.com

Unpublished interview: John Doe, (musician) in discussion with the author, Aug 23, 2013. Published interview: John Doe, interviewed by Jane Doe, Music Lovers, Aug 23, 2013. Personal communication: John Doe, email to the author, Aug 23, 2013.

' Book with one author: Lastname, Firstname. Title of Book. Place of publication: Publisher, Year of publication. Book with two authors: Lastname, Firstname and Lastname, Firstname. Title of Book. Place of publication: Publisher, Year of publication. Book with no known author: Title of Book. Place of publication: Publisher, Year of publication. Web page with author: Lastname, Firstname. “Title of Web Page.” Publishing Organization or Name of Website in Italics. Publication date and/or access date if available. URL. Web page without an author: “Title of Web Page.” Publishing Organization or Name of Website in Italics. Publication date and/or access date if available. URL. Published Interview: Lastname, Firstname of interviewee, place where interview was held, by Interviewer's Firstname Lastname, date.

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• ↑ https://guides.libraries.psu.edu/apaquickguide/intext
• ↑ https://owl.purdue.edu/owl/research_and_citation/apa_style/apa_formatting_and_style_guide/in_text_citations_the_basics.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/apa_style/apa_formatting_and_style_guide/in_text_citations_author_authors.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/apa_style/apa_formatting_and_style_guide/reference_list_electronic_sources.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/apa_style/apa_formatting_and_style_guide/reference_list_basic_rules.html
• ↑ http://www.apastyle.org/learn/faqs/cite-book-no-author.aspx
• ↑ https://libguides.jcu.edu.au/apa/reference-list
• ↑ https://guides.libraries.psu.edu/mlacitation/intext
• ↑ https://owl.purdue.edu/owl/research_and_citation/mla_style/mla_formatting_and_style_guide/mla_in_text_citations_the_basics.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/mla_style/mla_formatting_and_style_guide/mla_works_cited_electronic_sources.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/mla_style/mla_formatting_and_style_guide/mla_works_cited_other_common_sources.html
• ↑ https://research.wou.edu/c.php?g=551307&p=3785495
• ↑ https://www.chicagomanualofstyle.org/tools_citationguide/citation-guide-2.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/chicago_manual_17th_edition/cmos_formatting_and_style_guide/general_format.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/chicago_manual_17th_edition/cmos_formatting_and_style_guide/books.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/chicago_manual_17th_edition/cmos_formatting_and_style_guide/web_sources.html
• ↑ https://owl.purdue.edu/owl/research_and_citation/chicago_manual_17th_edition/cmos_formatting_and_style_guide/interviews_personal_communication.html
• ↑ https://www.chicagomanualofstyle.org/tools_citationguide/citation-guide-1.html

About This Article

To cite a quote using APA, put parentheses with the citation directly after the quoted material. For a citation with one or more authors, include their last names, the year of publication, and page number preceded by a "p.” If you're citing something but don't know the author, put the title of the publication and its date in parentheses. You can follow the same author-date format to cite web pages, but if you don't know the author or the date, use a shortened version of the web page title and write "n.d." after for "no date." To learn how to cite a quote using MLA or CMS, scroll down! Did this summary help you? Yes No

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How to Cite a Quote

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We all love a good quote. They’re memorable (“I’ll be back” – The Terminator), they communicate a lot succinctly (“Genius is 1 percent inspiration, 99 percent perspiration” – Thomas Edison), and you can use them in papers to help support your thesis statement. After all, the best research papers include references from other sources.

It can be tempting to throw in as many catchy quotes as possible but believe us when we say it’s totally not worth it. This method is deeply flawed. It doesn’t tell the reader where you got the quote or information and therefore doesn’t add credibility to your paper—you could’ve just made the whole thing up! So when you include a quote in your paper, you must provide a citation to give this important context.

So how do you write citations that properly tie in with your quotes? Here, we cover the basics for the most popular citation styles.

Need help seeing if anything in your paper needs a citation (or basic edits)? Citation Machine Plus’s grammar and essay checker may be for you! It’ll help detect grammatical errors, scan for potential plagiarism, and create automatic citations.

MLA style, short for “Modern Language Association,” is often used in social science, English, literature, and writing courses. This style uses an “author locator” system of citing. What this means is that generally, for the citation following the quote, you need to include the name of the author and the page number of the source you are quoting.

Here is an example of how to cite a quote within the text in MLA style:

When Scout says, “Well if we came out durin’ the Old Testament it’s too long ago to matter,” she is referring to her confusion as to how society is so capable of dividing different people into different classes (Lee 47).

Note that the parenthetical citation , or “in-text” citation, comes before the ending punctuation mark of the sentence.

These in-text citations correspond to a full citation that is located at the end of the paper. In MLA style, this list of full citations is called a “Works Cited” page.

Here is what the matching full citation would be for this in-text citation:

Lee, Harper.  To Kill a Mockingbird.* Harper Collins, 1960.

*Titles for sources are set in title case for MLA style citations.

If you need help with in-text and parenthetical citations, CitationMachine.net, can help. Our MLA citation generator is simple and easy to use!

Citations in APA, short for “American Psychological Association,” are very similar to those of the MLA citation system. This style is used mostly in science and psychology courses.

Instead of the page number, however, the date of publication is included with the author’s last name in the in-text citation.

Here is an example of how to cite a quote within the text in APA style:

When Scout says, “Well if we came out durin’ the Old Testament it’s too long ago to matter,” she is referring to her confusion as to how society is so capable of dividing different people into different classes (Lee, 1960).

These in-text citations, like in MLA style, also correspond to a full citation that is located at the end of the paper. In APA style, this list of full citations is called a “References” page.

The corresponding entry on the references page looks a bit different than an entry on a “Works Cited” page. Here is what the matching full citation would be for this in-text citation in APA :

Lee, H. (1960).  To kill a mockingbird . Philadelphia: Harper Collins.

*Titles for sources are often set in sentence case for APA-style citations. Check for rules that pertain to your particular source before handing in your paper.

Chicago Style

This citation style is a bit different from the rest. For detailed information, check out our guide on how to cite in Chicago-style format .

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What's the correct way to cite a paper cited by another paper?

The example is when you might be reading a certain paper, and the authors refer to another paper. You can't get that other paper as it's unpublished, or it's in a language that you can't read, or maybe something else.

My guess is:

Featherstone et al 1900 (in Thomas and Cullen 2002).

And how is it to be handled in the bibliography?

• 5 I think the answer would depend on why you want to cite Featherstone. Obviously it isn't because of the important things you learned from reading it! –  Nate Eldredge Commented Jun 13, 2012 at 19:59
• 4 Just to make this very specific situation clear (which I didn't want to do, as it works better for all if it's just a little general): I cannot obtain the original paper as our libraries cannot get it (perhaps if I had unlimited time and so on I could find it?). The paper I do have sufficiently details the data from the secondary source, and those data are all I need. Just data, in a table, very simple. There's a lot of hand-wringing going on here, and some insinuations about my character, but just have a little generosity of spirit for and some faith in your fellow humans. –  a different ben Commented Jun 14, 2012 at 2:19
• Possible duplicate of academia.stackexchange.com/q/12391/64 –  JRN Commented Sep 3, 2013 at 23:36

4 Answers 4

In APA style, you can write, (e.g., see this APA tutorial )

Featherstone et al 1900 (as cited in Thomas and Cullen 2002)

Of course, in general you should try your best to read the original and cite the original directly.

Someone in the comments asked:

"In such case do I need to list original paper also in reference section or only the recent one I am referring to?"

The reference to the original article is the more important reference to include, but you should include both in your reference list.

• 3 Thanks. That also tells me that the term is 'secondary source'. Another nice tool I've just found is this one: lib.unimelb.edu.au/recite/index.html –  a different ben Commented Jun 7, 2012 at 5:12
• I always interpret this to mean that Thomas and Cullen (2002) said something about Featherstone et al (1900) that is not obvious and often contentious or wrong. –  StrongBad Commented Jun 7, 2012 at 8:21
• 1 I associate it most with student lab reports. –  Jeromy Anglim Commented Jun 8, 2012 at 4:53
• In such case do I need to list original paper also in reference section or only the recent one I am referring to? –  Rajesh Commented Nov 22, 2017 at 9:47

The following is with regards to Chicago Style as of 11/25/2018 14.260: Citations taken from secondary sources Chapter Contents / Special Types of References / Citations Taken from Secondary Sources To cite a source from a secondary source (“quoted in . . .”) is generally to be discouraged, since authors are expected to have examined the works they cite. If an original source is unavailable, however, both the original and the secondary source must be listed.

If you are using a quote from author A that author B is citing, you would go ahead and use the quote from author A and cite it like this:

Blah blah, blahblahblah, blah blah blah-blah blah (qtd. in Author B 65).

If you cannot get that paper, you should not cite it.

What is a citation? The word citation comes from Latin verb cio (past participle: citum ) that means to call somebody , to invite somebody , or preferably to demand someone to give his own testimony .

So, in your case, if you would like to cite that paper, that means that you invite that paper to give its own testimony. But if it's not available , how could it do it?

Simply, it can't .

• 18 No, you have a moral obligation to cite it regardless (and the etymology is completely irrelevant). Deliberately not citing a relevant paper because you couldn't track down a copy is a potentially career-destroying ethical mistake. It's a matter of credit and historical information, not just ease of availability. (Of course, if you don't have access yourself you need to trust someone else as to what is in there, and you should indicate that, but it's not a reason to erase someone from history.) –  Anonymous Mathematician Commented Jun 7, 2012 at 14:41
• 6 This is plainly wrong: unfortunately, sometimes author A refers to private communication with B, so there is no other way fo you to cite B then by an indirect reference. –  Alexander Serebrenik Commented Jun 7, 2012 at 18:54
• 3 @AnonymousMathematician I think the obligation is to get the source (and have it translated if necessary) and then decide if you should cite it. Citing a source without having the source is unethical. –  StrongBad Commented Jun 8, 2012 at 8:05
• 12 Citing something has nothing to do with reading or not reading it. It means having it appear in your bibliography and get referred to in your text. You're right that there are issues in how you refer to it: you have a scholarly obligation to say correct things about it, and an ethical obligation not to be sloppy or misleading. Pretending to have read something you haven't is indeed ethically problematic, but that's a matter of how you cite it, not whether you cite it. Omitting the citation entirely is tantamount to pretending you aren't aware of the paper. –  Anonymous Mathematician Commented Jun 8, 2012 at 14:41
• 3 @AnonymousMathematician: "Citing something has nothing to do with reading or not reading it": see Simkin & Roychowdhury 2003 ... –  cbeleites Commented Feb 6, 2013 at 19:56

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FAQ: How do I cite a source quoted within another source (or how to cite a secondary source) in APA Style?

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According to the APA manual it is best to "cite secondary sources sparingly--for instance, when the original work is out of print, unavailable, or available only in a language that you do not understand. If possible, as a matter of good scholarly practice, find the primary source, read it, and cite it directly rather than citing a secondary source” (American Psychological Association [APA], 2020, p. 258).

Example of a Quote by One Author Used in the Text of Another Book, Within the Text

In your in-text citation identify the primary source, and include in parentheses "(as cited in Author, Date)". The reference list will only list the secondary source. In the examples below, Smith's study is the primary source and Queenan et al. is the secondary ("as cited in") source.

Example In-Text Citation

Smith's 2008 study (as cited in Queenan et al., 2016) found that...

Example Reference List Entry

Queenan, H. R., Johnson, F. W., Yili, T. S., Sannefort, M. R, & Langman, R. C. (2017). Cyberbullying in American youth . Oxford University Press.

More Information

• APA guide  (Shapiro Library)
• “Secondary Sources” page from the APA Style Blog (APA)

Further Help

This information is intended to be a guideline, not expert advice. Please be sure to speak to your professor about the appropriate way to cite sources in your class assignments and projects.

Campus Students

To access Academic Support, visit your Brightspace course and select “Tutoring and Mentoring” from the Academic Support pulldown menu.

Online Students

To access help with citations and more, visit the Academic Support via modules in Brightspace:

• Academic Support Overview: Getting Help with your Schoolwork This link opens in a new window

American Psychological Association. (2020). Publication manual of the American Psychological Association (7th ed.). https://doi.org/10.1037/0000165-000

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Secondary Sources

In scholarly work, a primary source reports original content; a secondary source refers to content first reported in another source.

• Cite secondary sources sparingly—for instance, when the original work is out of print, unavailable, or available only in a language that you do not understand.
• If possible, as a matter of good scholarly practice, find the primary source, read it, and cite it directly rather than citing a secondary source. For example, rather than citing an instructor’s lecture or a textbook or encyclopedia that in turn cites original research, find, read, and cite the original research directly (unless an instructor has directed you to do otherwise).

Secondary sources are covered in the seventh edition APA Style manuals in the Publication Manual Section 8.6 and the Concise Guide Section 8.6

Follow these directions when citing a secondary source:

• In the reference list, provide an entry for the secondary source that you used.
• In the text, identify the primary source and write “as cited in” the secondary source that you used.

If the year of publication of the primary source is known, also include it in the text citation.

For example, if you read a work by Lyon et al. (2014) in which Rabbitt (1982) was cited, and you were unable to read Rabbitt’s work yourself, cite Rabbitt’s work as the original source, followed by Lyon et al.’s work as the secondary source. Only Lyon et al.’s work appears in the reference list.

(Rabbitt, 1982, as cited in Lyon et al., 2014)

If the year of the primary source is unknown, omit it from the in-text citation.

Allport’s diary (as cited in Nicholson, 2003)

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General Library Research: Start Your Research

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Identify Your Topic

Brainstorm ideas.

Selecting a topic can be tricky. Your professor will usually assign a general theme that reflects the course material and your paper will need to focus on some aspect of that theme. Look through lecture notes and assigned readings to find a topic. Start by thinking of a topic you are interested in or curious about. Researching a topic that sparks your interest can be a great motivator.

Create a Concept Map

Once you've selected a general topic, create a concept map. Concept maps help you identify subtopics and topic-related ideas.

Write down your central topic (if you don't have one yet, use the course theme). Around the central topic, write down as many subtopics as you can think of. Continue writing related ideas and subtopics. As you write, think about how the subtopics might interconnect with each other or how they relate. Think of questions you might have about those connections.

Some helpful websites for concept mapping:

Visuwords - an interactive thesaurus and dictionary. Provides related terms, synonyms, broader and narrower terms.

Bubbl - an online concept mapping tool. (3 maps are free)

Find Background Information

Browse information sources.

Once you've identified a topic you'd like to explore further, take the time to get to know more about that topic. This step is called  background research . Background research helps you:

• Gain familiarity with a topic
• Identify differing perspectives of a topic
• Identify the experts, researchers, and scholars familiar with a topic 
• Explore possible research topics
• Identify specialized terms or jargon that can be used for searches later

Here are some sources of background information to consider as you explore your research topic:

• Encyclopedias provide basic information on a wide range of subjects. There are general encyclopedias, such as Encyclopedia Britannica , and subject-specific encyclopedias, such as the Encyclopedia of Social Media and Politics .
• Newspapers and magazines are regular publications of events covering social, political, or cultural interests. They often document the reactions, perspectives and opinions of an event around the time it happened. They can help you learn more about a culture, time period, and provide historical perspective to past events.
• Google - Search engines like Google can lead you to both good and bad information. Be critical of the websites you visit. For more help on evaluating sources go to the "Evaluate Your Sources" section below.
• Wikipedia - Wikipedia is a useful resource to start learning more about a topic, but remember that anyone can edit Wikipedia. Use the References of Further Readings at the end of an entry to verify information within the article. 

For more help, check out the Quick How To page on g enerating a research question .

Narrow Your Topic or Research Question

Identify open vs. close-ended questions.

Close-ended questions can be answered by a simple "yes" or "no," whereas open-ended questions go beyond a simple answer and require mindful, detailed responses.  Your research question should be open-ended. Open-ended questions require more critical thinking and sources of information to answer compared to close-ended questions.   Research questions often start with "how" or "why". Here is an example of a close-ended question modified into an open-ended question: Close-ended : Do many children in the U.S. have allergies? Open-ended : How does country of birth affect a child's chances of developing asthma?

Ask Who? What? When? Where? Why?

Once you have a basic understanding of your topic and the issues surrounding it, narrow your research question by asking the following questions:

• Who? - Are you interested in a specific group of people? Can you narrow your focus to a group or demographic, such as age, gender, ethnicity, location, or socio-economic status?
• What? - What are current issues around this topic? Anything in the news?
• When? - Is your topic current or historical? Was it during a specific time period? Are there any important events surrounding your topic? 
• Where? - Can your topic focus on a specific location? Where, geographically, might this topic be significant?
• Why? - Why is this topic important? Why should others be interested?

It's okay for your research question to change over time as you find more information about your topic, or take out ideas that don't work.

For more help, check out the libraries' Quick How To page on Generating a Research Question .

Refine Your Searches

Use keywords, not sentences.

The  keywords  you use are an important part of your search strategy.  Keywords , or  search words , are words or short phrases that represent the main ideas or concepts in your topic. Identify main concepts by writing down your research question and selecting nouns important to the meaning of your research question. For example, the research question "How is climate change affecting agriculture in Nevada?" has three main concepts:

• climate change
• agriculture

It's important to have additional keywords on hand, in case a search fails or doesn't produce desired results. For each main concept, write a list of related terms, synonyms, broader or narrower ideas. Brainstorm related terms, ask a classmate/professor/librarian for help, use a thesaurus, or continuing reading about your topic.

For more help, check out the Quick How To page on Choosing Keywords .

Evaluate Your Sources

As you search for information you will come across many different types of sources such as websites, journal articles and books, but how do you know if the information is suitable or appropriate for your research assignment? What does it mean for a source to be credible? And why is it important to use credible sources?

To learn more, check out the Quick How To page on Evaluating Sources .

• << Previous: Find Sources
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Watch CBS News

Details emerge after doctor raped and murdered in India as thousands protest

August 15, 2024 / 6:32 AM EDT / CBS/AFP

Thousands took to the streets of Kolkata early Thursday to condemn the rape and murder of a local doctor , demanding justice for the victim and an end to the chronic issue of violence against women in Indian society.

The discovery of the 31-year-old's brutalized body last week at a state-run hospital has sparked nationwide protests, with Prime Minister Narendra Modi demanding swift punishment for those who commit "monstrous" deeds against women.

Large crowds marched through the streets of Kolkata in West Bengal to condemn the killing, with a candlelight rally at midnight coinciding with the start of India's independence day celebrations on Thursday.

The protesters in Kolkata, who marched under the slogan "reclaim the night", called for a wider tackling of violence against women and held up handwritten signs demanding action.

"We want justice," read one sign at the rally. "Hang the rapist, save the women," read another.

"The atrocities against women do not stop," midnight marcher Monalisa Guha told Kolkata's The Telegraph newspaper.

"We face harassment almost on a daily basis," another marcher, Sangeeta Halder, told the daily. "But not stepping out because of fear is not the solution."

"Monstrous behavior against women"

Modi, speaking in New Delhi on Thursday morning at independence day celebrations, did not specifically reference the Kolkata murder, but expressed his "pain" at violence against women.

"There is anger for atrocities committed against our mothers and sisters, there is anger in the nation about that," he said.

"Crimes against women should be quickly investigated; monstrous behavior against women should be severely and quickly punished," he added. "That is essential for creating deterrence and confidence in the society."

Doctors are also demanding swift justice and better workplace security in the wake of the killing, with those in government hospitals across several states on Monday halting elective services "indefinitely" in protest.

Protests have since occurred in several other hospitals across the country, including in the capital.

"Doctors nationwide are questioning what is so difficult about enacting a law for our security," Dhruv Chauhan, from the Indian Medical Association's Junior Doctors' Network, told the Press Trust of India news agency. "The strike will continue until all demands are formally met."

The Telegraph on Thursday praised the "spirited public protests" across India.

"Hearteningly, doctors and medical organizations are not the only ones involved," it said in an editorial. "The ranks of the protesters have been swelled by people from all walks of life."

Police accused of mishandling case

Indian media have reported the murdered doctor was found in the teaching hospital's seminar hall, suggesting she had gone there for a brief rest during a long shift.

An autopsy has confirmed sexual assault, and in a petition to the court, the victim's parents have said that they suspected their daughter was gang-raped, according to Indian broadcaster NDTV.  

Though police have detained a man who worked at the hospital helping people navigate busy queues, officers have been accused of mishandling the case.

Kolkata's High Court on Tuesday transferred the case to the elite Central Bureau of Investigation (CBI) to "inspire public confidence."

In the early hours of Thursday, a mob of some 40 people angry at authorities' handling of the case stormed the grounds of the R.G. Kar Medical College and Hospital, the site of the murder.

The men smashed property and hurled stones at police, who fired tear gas in response, authorities said.

West Bengal lawmaker Abhishek Banerjee, from the Trinamool Congress party, condemned the "hooliganism and vandalism," but said "the demands of the protesting doctors are fair and justified."

History of sexual violence in India

Sexual violence against women is a widespread problem in India. An average of nearly 90 rapes a day were reported in India in 2022, according to  data  from the National Crime Records Bureau.

That year, police  arrested 11 people  after the alleged brutal gang rape and torture of a young woman that included her being paraded through the streets of Dehli. Also in 2022, a police officer in India was arrested after being  accused of raping  a 13-year-old girl who went to his station to report she had been gang-raped.

In March 2024, multiple Indian men were arrested after the  gang rape of a Spanish tourist  on a motorbike trip with her husband.

For many, the gruesome nature of the attack has invoked comparisons with the horrific 2012 gang rape and murder  of a young woman on a Delhi bus.

The woman became a symbol of the socially conservative country's failure to tackle sexual violence against women.

Her death sparked huge, and at times violent, demonstrations in Delhi and elsewhere.

Under pressure, the government introduced harsher penalties for rapists, and the death penalty for repeat offenders.

Several new sexual offences were also introduced, including stalking and jail sentences for officials who failed to register rape complaints.

• Sexual Violence

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Research shows our bodies go through rapid changes in our 40s and our 60s

For many people, reaching their mid-40s may bring unpleasant signs the body isn’t working as well as it once did. Injuries seem to happen more frequently. Muscles may feel weaker.

A new study, published Wednesday in Nature Aging , shows what may be causing the physical decline. Researchers have found that molecules and microorganisms both inside and outside our bodies are going through dramatic changes, first at about age 44 and then again when we hit 60. Those alterations may be causing significant differences in cardiovascular health and immune function.

The findings come from Stanford scientists who analyzed blood and other biological samples of 108 volunteers ages 25 to 75, who continued to donate samples for several years. 

“While it’s obvious that you’re aging throughout your entire life, there are two big periods where things really shift,” said the study’s senior author, Michael Snyder, a professor of genetics and director of the Center for Genomics and Personalized Medicine at Stanford Medicine. For example, “there’s a big shift in the metabolism of lipids when people are in their 40s and in the metabolism of carbohydrates when people are in their 60s.”

Lipids are fatty substances, including LDL, HDL and triglycerides, that perform a host of functions in the body, but they can be harmful if they build up in the blood.

The scientists tracked many kinds of molecules in the samples, including RNA and proteins, as well as the participants’ microbiomes.

The metabolic changes the researchers discovered indicate not that people in their 40s are burning calories more slowly but rather that the body is breaking food down differently. The scientists aren’t sure exactly what impact those changes have on health.

Previous research showed that resting energy use, or metabolic rate , didn’t change from ages 20 to 60. The new study’s findings don't contradict that.

The changes in metabolism affect how the body reacts to alcohol or caffeine, although the health consequences aren’t yet clear. In the case of caffeine, it may result in higher sensitivity. 

It’s also not known yet whether the shifts could be linked to lifestyle or behavioral factors. For example, the changes in alcohol metabolism might be because people are drinking more in their mid-40s, Snyder said.

For now, Snyder suggests people in their 40s keep a close eye on their lipids, especially LDL cholesterol.

“If they start going up, people might want to think about taking statins if that’s what their doctor recommends,” he said. Moreover, “knowing there’s a shift in the molecules that affect muscles and skin, you might want to warm up more before exercising so you don’t hurt yourself.”

Until we know better what those changes mean, the best way to deal with them would be to eat healthy foods and to exercise regularly, Snyder said.Dr. Josef Coresh, founding director of the Optimal Aging Institute at the NYU Grossman School of Medicine, compared the new findings to the invention of the microscope.

“The beauty of this type of paper is the level of detail we can see in molecular changes,” said Coresh, a professor of medicine at the school. “But it will take time to sort out what individual changes mean and how we can tailor medications to those changes. We do know that the origins of many diseases happen in midlife when people are in their 40s, though the disease may occur decades later.”

The new study “is an important step forward,” said Dr. Lori Zeltser, a professor of pathology and cell biology at the Columbia University Vagelos College of Physicians and Surgeons. While we don’t know what the consequences of those metabolic changes are yet, “right now, we have to acknowledge that we metabolize food differently in our 40s, and that is something really new.”

The shifts the researchers found might help explain numerous age-related health changes, such as muscle loss, because “your body is breaking down food differently,” Zeltser said.

Linda Carroll is a regular health contributor to NBC News. She is coauthor of "The Concussion Crisis: Anatomy of a Silent Epidemic" and "Out of the Clouds: The Unlikely Horseman and the Unwanted Colt Who Conquered the Sport of Kings." 

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Study reveals the benefits and downside of fasting

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Low-calorie diets and intermittent fasting have been shown to have numerous health benefits: They can delay the onset of some age-related diseases and lengthen lifespan, not only in humans but many other organisms.

Many complex mechanisms underlie this phenomenon. Previous work from MIT has shown that one way fasting exerts its beneficial effects is by boosting the regenerative abilities of intestinal stem cells, which helps the intestine recover from injuries or inflammation.

In a study of mice, MIT researchers have now identified the pathway that enables this enhanced regeneration, which is activated once the mice begin “refeeding” after the fast. They also found a downside to this regeneration: When cancerous mutations occurred during the regenerative period, the mice were more likely to develop early-stage intestinal tumors.

“Having more stem cell activity is good for regeneration, but too much of a good thing over time can have less favorable consequences,” says Omer Yilmaz, an MIT associate professor of biology, a member of MIT’s Koch Institute for Integrative Cancer Research, and the senior author of the new study.

Yilmaz adds that further studies are needed before forming any conclusion as to whether fasting has a similar effect in humans.

“We still have a lot to learn, but it is interesting that being in either the state of fasting or refeeding when exposure to mutagen occurs can have a profound impact on the likelihood of developing a cancer in these well-defined mouse models,” he says.

MIT postdocs Shinya Imada and Saleh Khawaled are the lead authors of the paper, which appears today in Nature .

Driving regeneration

For several years, Yilmaz’s lab has been investigating how fasting and low-calorie diets affect intestinal health. In a 2018 study , his team reported that during a fast, intestinal stem cells begin to use lipids as an energy source, instead of carbohydrates. They also showed that fasting led to a significant boost in stem cells’ regenerative ability.

However, unanswered questions remained: How does fasting trigger this boost in regenerative ability, and when does the regeneration begin?

“Since that paper, we’ve really been focused on understanding what is it about fasting that drives regeneration,” Yilmaz says. “Is it fasting itself that’s driving regeneration, or eating after the fast?”

In their new study, the researchers found that stem cell regeneration is suppressed during fasting but then surges during the refeeding period. The researchers followed three groups of mice — one that fasted for 24 hours, another one that fasted for 24 hours and then was allowed to eat whatever they wanted during a 24-hour refeeding period, and a control group that ate whatever they wanted throughout the experiment.

The researchers analyzed intestinal stem cells’ ability to proliferate at different time points and found that the stem cells showed the highest levels of proliferation at the end of the 24-hour refeeding period. These cells were also more proliferative than intestinal stem cells from mice that had not fasted at all.

“We think that fasting and refeeding represent two distinct states,” Imada says. “In the fasted state, the ability of cells to use lipids and fatty acids as an energy source enables them to survive when nutrients are low. And then it’s the postfast refeeding state that really drives the regeneration. When nutrients become available, these stem cells and progenitor cells activate programs that enable them to build cellular mass and repopulate the intestinal lining.”

Further studies revealed that these cells activate a cellular signaling pathway known as mTOR, which is involved in cell growth and metabolism. One of mTOR’s roles is to regulate the translation of messenger RNA into protein, so when it’s activated, cells produce more protein. This protein synthesis is essential for stem cells to proliferate.

The researchers showed that mTOR activation in these stem cells also led to production of large quantities of polyamines — small molecules that help cells to grow and divide.

“In the refed state, you’ve got more proliferation, and you need to build cellular mass. That requires more protein, to build new cells, and those stem cells go on to build more differentiated cells or specialized intestinal cell types that line the intestine,” Khawaled says.

Too much of a good thing

The researchers also found that when stem cells are in this highly regenerative state, they are more prone to become cancerous. Intestinal stem cells are among the most actively dividing cells in the body, as they help the lining of the intestine completely turn over every five to 10 days. Because they divide so frequently, these stem cells are the most common source of precancerous cells in the intestine.

In this study, the researchers discovered that if they turned on a cancer-causing gene in the mice during the refeeding stage, they were much more likely to develop precancerous polyps than if the gene was turned on during the fasting state. Cancer-linked mutations that occurred during the refeeding state were also much more likely to produce polyps than mutations that occurred in mice that did not undergo the cycle of fasting and refeeding.

“I want to emphasize that this was all done in mice, using very well-defined cancer mutations. In humans it’s going to be a much more complex state,” Yilmaz says. “But it does lead us to the following notion: Fasting is very healthy, but if you’re unlucky and you’re refeeding after a fasting, and you get exposed to a mutagen, like a charred steak or something, you might actually be increasing your chances of developing a lesion that can go on to give rise to cancer.”

Yilmaz also noted that the regenerative benefits of fasting could be significant for people who undergo radiation treatment, which can damage the intestinal lining, or other types of intestinal injury. His lab is now studying whether polyamine supplements could help to stimulate this kind of regeneration, without the need to fast.

“This fascinating study provides insights into the complex interplay between food consumption, stem cell biology, and cancer risk,” says Ophir Klein, a professor of medicine at the University of California at San Francisco and Cedars-Sinai Medical Center, who was not involved in the study. “Their work lays a foundation for testing polyamines as compounds that may augment intestinal repair after injuries, and it suggests that careful consideration is needed when planning diet-based strategies for regeneration to avoid increasing cancer risk.”

The research was funded, in part, by a Pew-Stewart Trust Scholar award, the Marble Center for Cancer Nanomedicine, the Koch Institute-Dana Farber/Harvard Cancer Center Bridge Project, and the MIT Stem Cell Initiative.

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A new study led by researchers at MIT suggests that fasting and then refeeding stimulates cell regeneration in the intestines, reports Katharine Lang for Medical News Today . However, notes Lang, researchers also found that fasting “carries the risk of stimulating the formation of intestinal tumors.” 

MIT researchers have discovered how fasting impacts the regenerative abilities of intestinal stem cells, reports Ed Cara for Gizmodo . “The major finding of our current study is that refeeding after fasting is a distinct state from fasting itself,” explain Prof. Ömer Yilmaz and postdocs Shinya Imada and Saleh Khawaled. “Post-fasting refeeding augments the ability of intestinal stem cells to, for example, repair the intestine after injury.” 

Prof. Ömer Yilmaz and his colleagues have discovered the potential health benefits and consequences of fasting, reports Max Kozlov for Nature . “There is so much emphasis on fasting and how long to be fasting that we’ve kind of overlooked this whole other side of the equation: what is going on in the refed state,” says Yilmaz.

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Breaking news, alex rodriguez posts cryptic quote after ex-fiancee jennifer lopez files for divorce from ben affleck.

Alex Rodriguez appears to be weighing in on the “Bennifer 2.0” breakup from the sidelines.

The retired MLB star, 49, posted a cryptic message on his Instagram Story Monday — the same day that his ex-fiancée, Jennifer Lopez, filed for divorce from her husband Ben Affleck.

Rodriguez shared a post citing one of his own quotes, which read, “You either go one way or the other, you might as well be the one deciding the direction.”

The former New York Yankee started dating Lopez, 55, in 2017. They announced their engagement in March 2019.

“We’re really happy,” Lopez said in an interview with People after Rodriguez proposed to her in the Bahamas.

“We have [an] appreciation for where we are in our lives today, and that’s what we’re enjoying the most,” Rodriguez added at the time.

But in March 2021, Page Six broke the news that the pair called off their engagement .

The stars released a joint statement in April 2021 confirming their breakup .

“We have realized we are better as friends and look forward to remaining so,” they said. “We will continue to work together and support each other on our shared businesses and projects. We wish the best for each other and each other’s children.”

Rodriguez has rarely commented on Lopez since their split, aside from when he told Entertainment Tonight  in Aug. 2021 that their relationship was “incredible.”

“I had five years of an incredible life and partnership and also with my daughters,” said the athlete, who shares daughters Natasha, 19, and Ella, 16, with ex-wife Cynthia Scurtis.

Since 2022, Rodriguez has been in a relationship with Jaclyn Cordeiro .

Meanwhile, Lopez got back together with Affleck shortly after her split from Rodriguez. The singer and the “Argo” director were initially together from 2002 to 2004.

As a reunited couple, Lopez and Affleck got engaged again in April 2022.

They tied the knot at the Little White Wedding Chapel in Las Vegas in July 2022, and then went on to hold a second, more extravagant wedding at Affleck’s home in Riceboro, Georgia, on Aug. 20, 2022.

“Now, we know. And there [are] no questions and there is no kind of like, ‘Well, let’s see how this goes,'” Lopez said about her relationship with Affleck in an interview with Zane Lowe of  Apple Music in Nov 2022.

“Like, ‘Nope, it’s me and you. That’s it. All the way, till the end. That’s it. It’s going to be us,'” she added.

Lopez filed for divorce from Affleck exactly two years to the day since their Georgia wedding ceremony.

She listed their official date of separation as April 26, 2024, which was shortly before the rumors of their split started when Lopez attended the Met Gala by herself .

According to a People report, Affleck  had no interest in fixing his marriage to Lopez , which sparked her decision to file for divorce.

“She’s very disappointed and sad,” a source said about Lopez. “She tried really hard to make things work and is heartbroken.”

The exes, who have five children combined, reportedly didn’t sign a prenup .

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• Knowledge Base
• Citing sources

How to Cite an Image | Photographs, Figures, Diagrams

Published on March 25, 2021 by Jack Caulfield . Revised on June 28, 2022.

To cite an image, you need an in-text citation and a corresponding reference entry. The reference entry should list:

• The creator of the image
• The year it was published
• The title of the image
• The format of the image (e.g., “photograph”)
• Its location or container (e.g. a website , book , or museum)

The format varies depending on where you accessed the image and which citation style you’re using: APA , MLA , or Chicago .

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Table of contents

Citing an image in apa style, citing an image in mla style, citing an image in chicago style, frequently asked questions about citations.

In an APA Style reference entry for an image found on a website , write the image title in italics, followed by a description of its format in square brackets. Include the name of the site and the URL. The APA in-text citation just includes the photographer’s name and the year.

The information included after the title and format varies for images from other containers (e.g. books , articles ).

When you include the image itself in your text, you’ll also have to format it as a figure and include appropriate copyright/permissions information .

Images viewed in person

For an artwork viewed at a museum, gallery, or other physical archive, include information about the institution and location. If there’s a page on the institution’s website for the specific work, its URL can also be included.

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The AI-powered Citation Checker helps you avoid common mistakes such as:

• Missing commas and periods
• Incorrect usage of “et al.”
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• Missing reference entries

In an MLA Works Cited entry for an image found online , the title of the image appears in quotation marks, the name of the site in italics. Include the full publication date if available, not just the year.

The MLA in-text citation normally just consists of the author’s last name.

The information included after the title and format differs for images contained within other source types, such as books and articles .

If you include the image itself as a figure, make sure to format it correctly .

A citation for an image viewed in a museum (or other physical archive, e.g. a gallery) includes the name and location of the institution instead of website information.

In Chicago style , images may just be referred to in the text without need for a citation or bibliography entry.

If you have to include a full Chicago style image citation , however, list the title in italics, add relevant information about the image format, and add a URL at the end of the bibliography entry for images consulted online.

Chicago also offers an alternative author-date citation style . Examples of image citations in this style can be found here .

For an image viewed in a museum, gallery, or other physical archive, you can again just refer to it in the text without a formal citation. If a citation is required, list the institution and the city it is located in at the end of the bibliography entry.

The main elements included in image citations across APA , MLA , and Chicago style are the name of the image’s creator, the image title, the year (or more precise date) of publication, and details of the container in which the image was found (e.g. a museum, book , website ).

In APA and Chicago style, it’s standard to also include a description of the image’s format (e.g. “Photograph” or “Oil on canvas”). This sort of information may be included in MLA too, but is not mandatory.

Untitled sources (e.g. some images ) are usually cited using a short descriptive text in place of the title. In APA Style , this description appears in brackets: [Chair of stained oak]. In MLA and Chicago styles, no brackets are used: Chair of stained oak.

For social media posts, which are usually untitled, quote the initial words of the post in place of the title: the first 160 characters in Chicago , or the first 20 words in APA . E.g. Biden, J. [@JoeBiden]. “The American Rescue Plan means a $7,000 check for a single mom of four. It means more support to safely.”

MLA recommends quoting the full post for something short like a tweet, and just describing the post if it’s longer.

In APA , MLA , and Chicago style citations for sources that don’t list a specific author (e.g. many websites ), you can usually list the organization responsible for the source as the author.

If the organization is the same as the website or publisher, you shouldn’t repeat it twice in your reference:

• In APA and Chicago, omit the website or publisher name later in the reference.
• In MLA, omit the author element at the start of the reference, and cite the source title instead.

If there’s no appropriate organization to list as author, you will usually have to begin the citation and reference entry with the title of the source instead.

Check if your university or course guidelines specify which citation style to use. If the choice is left up to you, consider which style is most commonly used in your field.

• APA Style is the most popular citation style, widely used in the social and behavioral sciences.
• MLA style is the second most popular, used mainly in the humanities.
• Chicago notes and bibliography style is also popular in the humanities, especially history.
• Chicago author-date style tends to be used in the sciences.

Other more specialized styles exist for certain fields, such as Bluebook and OSCOLA for law.

The most important thing is to choose one style and use it consistently throughout your text.

Cite this Scribbr article

If you want to cite this source, you can copy and paste the citation or click the “Cite this Scribbr article” button to automatically add the citation to our free Citation Generator.

Caulfield, J. (2022, June 28). How to Cite an Image | Photographs, Figures, Diagrams. Scribbr. Retrieved August 21, 2024, from https://www.scribbr.com/citing-sources/cite-an-image/

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