How to Cite Multiple Authors in APA 7 (and MLA 9)

The APA 7 rule that simplified everything

APA 6 made students memorize a three-zone system: two authors both cited, three to five authors all listed at first citation then et al., six or more et al. always. APA 7 collapsed it to two rules — both authors or et al. — effective from the first citation. If your instinct says 'but first citation lists everyone', that is APA 6 muscle memory; the current manual is simpler.

The ampersand rule trips people in prose: inside parentheses use & — (Smith & Jones, 2024) — but in the running text write 'Smith and Jones (2024) argued...' with the word and. MLA 9 never uses the ampersand in-text at all: (Smith and Jones 12), with no comma before the page number. The two styles disagree on punctuation constantly; switching styles mid-paper without re-checking is the most common source of citation drift.

The numbers at a glance

Author counts in-text, style by style — the range, and where each row actually shows up in coursework. Skim it first; the sections below explain why the range exists and which row applies to you.

The 21-author rule and other reference-list cases

In the reference list, APA 7 requires up to 20 authors listed in full. At 21 or more, list the first 19, an ellipsis, and the final author — the manual's acknowledgment that consortium papers now have 200+ contributors. MLA 9 lists up to two authors in the entry, then switches to first-author-et-al for three or more, in the reference list as well as in-text.

Group authors — organizations — count as single authors: (American Psychological Association [APA], 2024) on first use with the bracketed acronym, then (APA, 2024). The abbreviation introduction is optional but saves space when the organization recurs. One subtle case: two different author groups sharing an acronym spell them out every time, because (APA, 2024) is ambiguous if the American Philological Association also appears.

Ambiguity: the rule graders actually check

Citations exist so a reader can locate the exact source. When two in-text citations shorten to the same form — Smith, Chen and Ortiz (2021) and Smith, Rivera and Patel (2021) both become (Smith et al., 2021) — APA 7 requires spelling out as many authors as needed to disambiguate: (Smith, Chen, et al., 2021) and (Smith, Rivera, et al., 2021). The rule applies whenever shortened forms collide, regardless of author count.

Same first author, different years is not ambiguous — years distinguish: (Smith, 2022; Smith, 2024). Same authors, same year gets letters: 2024a, 2024b, assigned by the reference list's alphabetical order of titles. Graders spot ambiguous citations because they make double-checking impossible; disambiguation is five minutes of editing and the difference between a clean reference audit and a forced revision.

et al. mechanics: punctuation, verbs, and voice

The punctuation is 'et al.' — period after al., no period after et (et is a complete Latin word). No italics, no comma between the first author's name and et al., though APA requires the comma after et al. before the year inside parentheses: (Smith et al., 2024). In running text: 'Smith et al. (2024) found...' with the period doing double duty.

Grammar follows the noun: 'Smith et al. (2024) found' — plural verb, because et al. means 'and others'. The special case is two authors with the same surname: APA requires initials every time (J. Smith, 2020; R. Smith, 2022) to keep them distinct. These mechanics are small, but they recur dozens of times per paper, which is why citation errors cluster here — ten instances of one wrong pattern read as systemic carelessness rather than one typo.

Three minutes to a clean citation

Edge-case citations punish hesitation, not ignorance: the student who spends twenty minutes googling a no-author format loses more time to doubt than the format ever costs. Decide the pattern once — title moves forward, organization counts as author, n.d. when no date exists anywhere — and apply it mechanically. Consistency across your list matters more to graders than perfect recall of manual arcana.

Automate what's mechanical. The citation generator below formats journal articles, books, chapters and websites in all three major styles, including the awkward cases on this page. Paste the metadata, copy the output, done — the minutes you save belong to analysis, which is where rubric points actually live. Cross-check in-text forms against the table above and the reference list is submission-ready.