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Proper APA format for sources with three to six authors requires listing the last names of all authors the first time you cite the source as well as the publication date. ...results indicated a strong positive correlation between the two variables (Robsen, Hutchkins, Ru, & Selanis, 1989).
1 APA in-text citation must include at least the author's name; also, the year of publication (with letters for multiple sources published the same year [1989a, 1989b]), and the page number, designated as p. 123. 2  APA uses more commas to separate blocks of information than MLA.