APA style is the offical citaiton format for the The American Psychological Association but is used by most of the social sciences. Use the following sources to properly format your citations in APA style.
Chicago is used in the humanities, especially History. (If you have been told to use Turabian style for citations, it is almost identical to Chicago.)
UCCS students and faculty have access to RefWorks. You can set up an account with your UCCS email address.
The guide linked below describes how to use RefWorks in more detail: