An in-text citation is a short reference you place inside the body of your paper, right next to the information you borrowed, so readers can locate the full source in your bibliography. The exact format depends on which style guide you’re using, but every in-text citation serves the same purpose: it connects a specific claim, quote, or idea to its origin without interrupting the flow of your writing.
The Two Basic Placements
Regardless of style, you have two ways to work a citation into a sentence: parenthetical or narrative. Understanding the difference gives you flexibility in how your writing reads.
A parenthetical citation puts all the source information inside parentheses, usually at the end of the sentence before the period. For example: Exposure to false balance in news coverage can distort public understanding (Koehler, 2016). Everything the reader needs sits quietly at the end.
A narrative citation weaves the author’s name into the sentence itself, with only the remaining details in parentheses. For example: Koehler (2016) noted that false balance in news coverage can distort public understanding. This approach works well when you want to emphasize who said something, not just what was said. In rare cases where both the author and date appear naturally in your sentence, you can skip the parentheses entirely: In 2016, Koehler noted the dangers of falsely balanced news coverage.
APA Style: Author-Date Method
APA is the most common format in the social sciences, nursing, and education. It uses the author-date method, meaning every in-text citation includes the author’s last name and the year of publication.
For a paraphrase or summary, you need only the author and year. Page numbers are optional for paraphrases, though APA encourages including them for longer works so the reader can find the passage. A basic paraphrase citation looks like this: (Jones, 1998).
For a direct quotation, you must add the page number. Use “p.” for a single page and “pp.” for a range: (Jones, 1998, p. 199) or (Jones, 1998, pp. 199–201). If the source has no page numbers, as with many websites, reference another identifying element like a paragraph number or section heading instead.
Short quotations (under 40 words) stay inline with quotation marks around them. Long quotations (40 words or more) get formatted as a freestanding indented block with no quotation marks. For block quotes, the parenthetical citation comes after the closing punctuation mark rather than before it.
Multiple Authors in APA
For a work with two authors, include both names every time you cite it: (Smith & Jones, 2020). For three or more authors, list only the first author followed by “et al.” from the very first citation onward: (Fried et al., 2022). This rule, introduced in the 7th edition of APA, simplified an older system that required listing up to five names on first use.
Organizations and Unknown Authors in APA
When an organization is the author, spell out the full name the first time. If the organization has a well-known abbreviation, put it in brackets after the full name so you can use the short version later. First citation: (Mothers Against Drunk Driving [MADD], 2000). Every citation after that: (MADD, 2000).
When no author is listed at all, use a shortened version of the title in place of the author’s name. Italicize it if the source is a book or report. Put it in quotation marks if it’s an article, chapter, or web page. For example: (“Using Citations,” 2001).
MLA Style: Author-Page Method
MLA is the standard in the humanities, especially English and literature courses. Instead of author-date, MLA uses author-page. You include the author’s last name and the page number where the information appears, with no comma between them and no “p.” abbreviation: (Smith 23).
If you mention the author’s name in the sentence, only the page number goes in parentheses: Smith argues that the data supports this conclusion (23). When quoting or paraphrasing a source with no page numbers, such as a website, the parenthetical citation contains just the author’s last name.
For works with three or more authors, MLA also uses “et al.” after the first author’s name: (Johnson et al. 45). For two authors, include both: (Smith and Jones 12). Notice MLA uses “and” between names rather than the ampersand that APA uses.
Chicago Style: Notes and Bibliography
Chicago style is common in history, art, and some social sciences. It offers two systems, but the notes-bibliography version is what most students encounter. Instead of placing a citation in parentheses, you insert a superscript number at the end of the relevant sentence. That number corresponds to a footnote at the bottom of the page (or an endnote at the back of the paper) containing the full source details.
The first time you cite a source, the footnote includes the author’s full name, the title, publication information, and the page number. Subsequent references to the same source use a shortened form with just the author’s last name, a short title, and the page number. Chicago also has an author-date option that works similarly to APA, primarily used in the sciences.
How to Cite Secondary Sources
Sometimes you’ll read about a study or idea in one source that originally came from a different source. For instance, you’re reading a 2014 article by Lyon that references a 1982 study by Rabbitt, but you never read Rabbitt’s original work. This is called a secondary source, and you need to be transparent about it.
In APA, your in-text citation identifies both the original work and the source you actually read, connected by “as cited in”: (Rabbitt, 1982, as cited in Lyon et al., 2014). Your reference list includes only the source you read (Lyon), not the one you didn’t (Rabbitt). In MLA, you handle it similarly by writing “qtd. in” before the source you actually consulted. The key principle across all styles is the same: never pretend you read the original if you only encountered it secondhand.
Punctuation and Placement Rules
Small punctuation details matter more than you might expect. In both APA and MLA, a parenthetical citation placed at the end of a sentence goes before the period: …end of the sentence (Smith, 2020). The period follows the closing parenthesis, not the quote or the sentence text. The one exception is block quotations, where the citation comes after the final period.
When other text shares the parentheses with a citation in APA, separate them with a semicolon rather than nesting parentheses inside parentheses: (e.g., falsely balanced news coverage; Koehler, 2016). If you need to add context like “see” or “for more detail,” use commas around the year: (see Koehler, 2016, for more detail).
When to Cite and When Not To
You need an in-text citation whenever you use someone else’s words, ideas, data, or arguments. That includes direct quotes, paraphrases, statistics, charts, and even ideas you’ve substantially reworded. The citation isn’t just for exact wording; it’s for borrowed thinking.
You do not need to cite common knowledge, which is information that most educated readers would already know or that appears across many general sources without attribution. The earth orbits the sun. World War II ended in 1945. These don’t need citations. But if you’re unsure whether something counts as common knowledge, the safer choice is to cite it. An unnecessary citation is a minor style issue. A missing citation can be flagged as plagiarism.
Quick Reference by Style
- APA: (Author, Year) for paraphrases; (Author, Year, p. #) for direct quotes. Use et al. for three or more authors from the first citation.
- MLA: (Author Page) with no comma and no “p.” Use et al. for three or more authors.
- Chicago (notes): Superscript number linking to a footnote or endnote. Full details on first use, shortened form after that.
Check your assignment guidelines or your instructor’s requirements to confirm which style you should use. Once you know the system, the mechanics become routine: identify the author, locate the page or date, and place the citation where your reader can see exactly which ideas are yours and which came from somewhere else.