For the most accurate citation format, see the Publication Manual of the American Psychological Association. By listing the source of this borrowed material, you let readers know it is not your own. If you were to present material that you didn't think of or write yourself as though you had, you would be guilty of plagiarism. Rather than use footnotes, APA style calls for the use of parenthetical documentation within the text. Separate the author and year with a comma.
Punctuation appears after the parentheses.
Full publication information for the book or work from which the information is derived appears on the reference list. However, in a direct quotation in the text, include the page number in parentheses. If a work has two authors, always cite both authors' last names every time the reference occurs in text. If three to five names begin the reference entry in the text, cite all authors and the year the first time the reference occurs. Wasserstein et al.