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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).
This page describes the correct format for in-text citations in APA: Basic format. Quotations and block quotations. Page numbers. Reference within a source (secondary source) Citing a source multiple times in one paragraph. Title in author position. Entries with the same author(s) and year of publication.