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)

 There are also brief online guides (links below):