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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).
The parenthetical author's name and page number are placed at the end of the cite. APA and MLA require full cites in reference or works cited pages of essays. APA cites include the author's name, publication year, book title, and location and name of the publisher. MLA requires the author's last and first name, book title, location and name of the publisher, and year published. MLA also identifies the publication medium at the end of the cite, such as print.