APA vs MLA In-Text Citations

APA uses author and year: (Smith, 2020). MLA uses author and page: (Smith 42). Same idea, different data, and mixing them up is the fastest way to lose easy points on a paper.

The one-sentence rule

If your class is psychology, education, nursing, business, or any social science, you're almost always using APA. If it's English, literature, philosophy, or most humanities courses, you're using MLA. Check the syllabus before you write a single citation. Rewriting 30 in-text cites the night before it's due is not fun.

Side by side

Same source, same quote, two formats.

Source: a 2020 book by Jane Smith, page 42, quoting: "Sleep debt compounds within a week."

APA (7th edition): Sleep debt "compounds within a week" (Smith, 2020, p. 42).

MLA (9th edition): Sleep debt "compounds within a week" (Smith 42).

Three differences worth memorizing:

1. APA needs the year. MLA doesn't.
2. APA uses a comma between author and year. MLA uses no comma between author and page.
3. APA writes "p. 42" for a page number. MLA writes just "42".

When you actually need a page number

APA only requires a page number for direct quotes. For a paraphrase, (Smith, 2020) is enough, though your professor may still want the page. MLA wants a page number for both quotes and paraphrases whenever the source has pages. If it's a website with no pages, MLA drops the number and uses just (Smith).

Two authors, three authors, more

APA:

• Two authors, every time: (Smith & Chen, 2020)
• Three or more, first cite and every cite after: (Smith et al., 2020)

MLA:

• Two authors: (Smith and Chen 42)
• Three or more: (Smith et al. 42)

Note the "and" vs "&". APA uses the ampersand inside parentheses. MLA spells out "and". If you switch styles mid-paper, this is one of the first things a grader spots.

No author? No date? No page?

APA replaces a missing author with the first few words of the title in quotes or italics: ("Sleep and Memory," 2020). If there's no date, use n.d.: (Smith, n.d.).

MLA does the same swap for a missing author: ("Sleep and Memory" 42). If there's no page and no other locator, you just use the author: (Smith).

Signal phrases (naming the author in the sentence)

You don't have to cram everything into parentheses. Both styles let you name the author in your sentence and shorten the citation.

APA: Smith (2020) argued that sleep debt "compounds within a week" (p. 42).

MLA: Smith argues that sleep debt "compounds within a week" (42).

Two things to notice. APA uses past tense ("argued", "found", "showed") for reporting research. MLA uses present tense ("argues", "writes", "claims") because literary works are treated as ongoing. Swapping tense is a small tell that catches graders' eyes.

Switching a paper from one to the other

If your professor changes formats mid-semester, or you're recycling a paper for a different class, work through this list.

1. Find every parenthetical citation. Search for "(" if you have to.
2. Add or remove the year.
3. Change commas to spaces (or spaces to commas) between author and locator.
4. Add or strip "p." before page numbers.
5. Swap "&" for "and" (going APA to MLA) or the reverse.
6. Fix verb tense in signal phrases if you're being thorough.
7. Rebuild your reference list. APA calls it "References". MLA calls it "Works Cited". The entry format is different too, so don't just rename the heading.

Common mistakes that cost points

• Using (Smith, 42) in MLA. That looks like APA with a bad year.
• Writing (Smith 2020, 42) in MLA. There's no comma and no year unless you have two sources by the same author.
• Forgetting "p." in APA quotes.
• Using "et al." for two authors. Both styles want both names spelled out for two.
• Putting the period before the parenthesis. In both styles, the parenthetical citation comes before the closing period: ...compounds within a week (Smith 42).

Which edition are you using?

APA is on the 7th edition (2019). MLA is on the 9th edition (2021). If you're citing older examples from a study guide, double-check they match the current rules. APA 6 required "et al." only for six or more authors. That changed in APA 7 to three or more.

Pick your format, stay consistent, and you're already ahead of half your class.

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