APA uses the author/date method for citing sources in your text.
Example: (Golden & Brown, 2005). Or: Golden and Brown (2005) showed . . .
If you quote you also mention the page where the quotation can be found in your source:
(Golden & Brown, 2005, p. 23). Or: Golden and Brown (2005, p. 23) point out ". . ."
In a reference list at the end of your document you mention all the sources you cited in your text, but not more than those cited there.
The rules for citing in APA style are included in the:
American Psychological Association (2010). Publication manual of the American Psychological Association (6th ed.). Washington, DC: Author.
This work also contains standards for other parts of manuscripts.
The Library of the Radboud University holds several copies of this work.