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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 style uses the author-date system for citing references in the text of your paper. Each reference. cited in the text will appear alphabetically in your reference list. A helpful chart of basic citation. styles appears on page 177 in the APA Publication Manual. Direct quotations (APA Manual, p.170-171) In addition to the author and the date, direct quotations must also include the page.