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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).
In general, APA in-text documentation format uses the author-date style of citation, with the author's name, followed by the year of publication, cited within the body text of an article. The complete details on the source document are included in the References list at the end of the paper.