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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).
APA uses the author-date method of citation. The last name of the author and the date of publication are inserted in the text in the appropriate place. When referencing or summarizing a source, provide the author and year.