There are several citation style guides used by various academic disciplines. A few pertain to the areas of Geography. They include the APA style, along with a couple from AAG (The Association of American Geographers).
Please check with your instructor for his/her preferred style.
Print formats of the APA manual are available in the VIU Library Collection:
Publication manual of the American Psychological Association, 6th ed
Call Number: BF 76.7 P83 2010 (Nanaimo, Cowichan, & Powell River)
APA style guide to electronic references
Call Number: BF 76.7 P831 2007 (Nanaimo, Cowichan, & Powell River)