MLA vs APA: Differences in Format, Citations, and When to Use Each

By MLA Generator Editorial Team · Published February 18, 2026

MLA and APA are the two citation styles most students encounter, often in the same year — MLA in a literature seminar, APA in a psychology elective. They look superficially similar (both put author and source information in parentheses inside the text), but the conventions diverge in small ways that compound. A paper that uses APA conventions on an MLA rubric reads as off; a paper that mixes the two reads as careless. This guide covers what each style is for, where they actually differ, and the small handful of cases that cause most cross-style errors.

The shortest answer: APA puts author and year in the parenthetical, MLA puts author and page. APA uses sentence case for article titles, MLA uses title case throughout. APA labels the list “References,” MLA labels it “Works Cited.” Pick the one your discipline expects, then apply it consistently.

What each style is for

APA 7 is the citation style for psychology, education, nursing, and most of the social sciences. The American Psychological Association has maintained it since 1929; the current edition is the seventh, released in October 2019. APA’s author–date in-text format puts the year of publication in front of the reader on every citation — a deliberate design choice for evidence-based fields where the currency of a finding matters as much as the finding itself.

MLA 9 is the citation style for literature, languages, film, and humanities composition. The Modern Language Association has published it since 1951; the current edition is the ninth, released in 2021. MLA’s author–page in-text format prioritizes the location of the specific passage being analyzed — a deliberate design choice for humanities work, where readers and graders may want to flip directly to the lines under discussion.

If your discipline is in the social sciences or health sciences, APA is your default. If your discipline is in the humanities, MLA is your default. The exceptions are small enough to be specified by the assignment or the journal.

In-text citation mechanics

The most visible difference. Same single-author source — Chen’s 2021 book The Architecture of Working Memory, with a quoted passage on page 47.

The differences are systematic. APA always shows the year; MLA never does. APA uses an ampersand for two authors in parentheticals (Lin & Patel); MLA spells out “and” (Lin and Patel). APA uses p. before page numbers; MLA writes the page number without an abbreviation. APA’s et al. threshold is three or more authors; MLA’s is the same. APA uses n.d. for no date; MLA simply omits the date.

Reference list versus Works Cited

The same journal article — Goldstein, Ramanathan, and O’Connor’s 2024 paper — formatted in each style’s reference list.

APA 7: Goldstein, A., Ramanathan, P., & O’Connor, L. (2024). Sleep consolidation effects on procedural learning in adolescents. Journal of Cognitive Development, 19(2), 87–104. https://doi.org/10.1037/cogdev0000412

MLA 9: Goldstein, Aaron, et al. “Sleep Consolidation Effects on Procedural Learning in Adolescents.” Journal of Cognitive Development, vol. 19, no. 2, 2024, pp. 87–104. https://doi.org/10.1037/cogdev0000412.

Six structural differences are visible at once:

• Heading. APA labels the list References (centered, bolded). MLA labels it Works Cited (centered, no bold).
• Author format. APA lists authors by surname and initial, joining the final two with an ampersand; the reference-list cap is 20 authors before truncating with an ellipsis and the final author. MLA writes the first author’s full given name and uses et al. for three or more authors.
• Year placement. APA parenthesizes the year immediately after the author block. MLA places the year later — mid-entry for journal articles (after the issue number, before the page range), at the end of the publisher block for books — rather than directly after the author.
• Article title capitalization. APA uses sentence case — only the first word, proper nouns, and the first word after a colon are capitalized. MLA uses title case — every significant word is capitalized.
• Journal title. Both italicize. Both use title case. The volume and issue notation is slightly different — APA puts them tight to the journal name (*Journal*, 19*(2),); MLA writes them out (*Journal*, vol. 19, no. 2).
• Hanging indent. Both use a half-inch hanging indent. This is the one place the two styles match exactly.

Other structural differences

The nine-element container model. MLA 9 organizes every Works Cited entry around nine “core elements,” in order: author, title of source, title of container, other contributors, version, number, publisher, publication date, location. This is MLA’s distinctive innovation since the eighth edition: rather than memorize a different template for each source type, you build any entry by filling in whichever of the nine elements apply. APA still uses source-type-specific templates — a book template, a journal article template, a website template — each with its own field order.

Capitalization. APA’s sentence-case rule applies only to article and chapter titles; journal names, book titles, and proper nouns retain title case. MLA uses title case throughout. The two conventions produce reference lists that look different at a glance — APA’s article titles read like prose; MLA’s read like book covers.

URL handling. APA dropped the “Retrieved from” prefix in APA 7; MLA never used a prefix phrase. The two styles differ on the protocol: APA keeps the full URL including https://, while MLA 9 strips the protocol on plain URLs (www.example.com/...) but retains https://doi.org/ on DOIs. APA omits access dates for stable sources; MLA treats them as optional but recommended for any web source likely to change.

DOI formatting. Identical in both: full clickable URL beginning with https://doi.org/. The pre-APA-7 form doi:10.xxx/yyy is no longer current and should not appear in new writing.

The page number rule for paraphrases. MLA requires page numbers for both quotes and paraphrases when the source has pages — every in-text citation that draws on a specific passage should locate it. APA requires page numbers only for direct quotes; paraphrases can use the author and year alone, though APA encourages including a locator when it helps the reader find the passage.

Which style to use when you have a choice

When the assignment specifies a style, your choice is made. When it does not, three heuristics produce a reasonable default.

Match your discipline’s journals. If the journals you cite most are APA-formatted, your paper should be APA. If they are MLA-formatted, your paper should be MLA. Matching the house style of the work you cite makes the bibliography flow naturally and signals familiarity with the field’s conventions.

Match the rest of your degree program’s writing. If every other paper you have written in your major was in APA, sticking with APA for one more is the path of least resistance — both for you and for graders who are reading dozens of papers in one style and will notice an outlier.

When in doubt, ask. A one-line email to the instructor saves a re-format later. “The rubric says citations should follow a recognized academic style; would APA be appropriate, or do you prefer MLA?” gets a clear answer in most cases.

Common cross-style mistakes

Mixing the in-text formats. Writing (Chen, 2021) (APA) in one paragraph and (Chen 47) (MLA) in another. This is the single most common citation error in undergraduate writing.

Putting a year in an MLA in-text citation. (Chen 2021) — no comma, no page — is neither style. MLA’s in-text citation never includes a year; when you need to distinguish two works by the same author, MLA uses a short title ((Chen, *Architecture* 47)), not a year.

Using APA’s p. abbreviation in MLA. APA writes (Chen, 2021, p. 47); MLA writes (Chen 47) with no abbreviation. Mixing them looks like a draft that was reformatted halfway.

Using sentence case for article titles in MLA. MLA uses title case for everything. Sentence case is APA’s distinctive capitalization rule and looks wrong on an MLA paper.

Using “Works Cited” on an APA paper or “References” on an MLA paper. The labels are required to match the style. A heading mismatch is one of the first things a marker notices, and it suggests the rest of the paper may also be in the wrong style.

Forgetting the bold heading in APA. APA 7 specifies the References heading as centered and bold. MLA and Chicago do not bold. A non-bold References heading on an APA paper is a small but registered submission error.

Editorial methodology and sources