There are several citation style guides used by disciplines within the Social Sciences. The guide primarily used for Psychology is the APA style guide.
Please check with your instructor for his/her preferred style.
Publication manual of the American Psychological Association, 6th ed
Call Number: BF 76.7 P83 2010 (Nanaimo, Cowichan, & Powell River) (2 copies in Stacks, 1 copy on Reserve)
(2 copies in Stacks, 1 copy on Reserve)
APA style guide to electronic references
Call Number: BF 76.7 P831 2007 (Nanaimo, Cowichan, & Powell River)
There are also brief online guides (links below):