How do I cite a resource by two authors in APA Style?
If a work has two authors, insert an ampersand (&) between the authors’ names in the citation. Cite both authors every time the resource is referenced (American Psychological Association, 2010, p. 175). For example, (Green & Doble, 1988, p. 34).
For other information regarding citing works by multiple authors, please see "How do I cite a resource by three to five authors in APA Style?" and "How do I cite a resource with six or more authors in APA Style?".
American Psychological Association. (2010). Publication manual of the American Psychological Association (6th ed.). Washington, DC: Author.