From an English teachers pet peeve list. This is #1.
et al.: Number one pet peeve: Indicating “and others” in citations. If you cite one author in body text, it should be “AuthorOne”. Two authors: “AuthorOne and AuthorTwo”. Three or more authors: “AuthorOne et al.” (although, for three authors, I understand “AuthorOne, AuthorTwo, and AuthorThree” is OK). “et al.” stands for “et alia”. It does NOT have a period after “et” and DOES have one after “al”.
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