This page provides guidance on APA 6, a referencing style described in in the 6th edition of the Publication Manual of the American Psychological Association (APA).
The current version of APA Style is APA 7 and you can find guidance in the APA 7 page:
Publication Manual of the American Psychological Association, Seventh edition by 
Publication Manual of the American Psychological Association, Sixth edition by 
Concise Rules of APA Style, Sixth edition by
