There are a variety of citation styles available for academic writing. Depending on your research area or your professor's preference, you'll be using one of the following styles. We've linked to the appropriate guide for each citation style.
APA Guide on Purdue OWL // APA Style Guide
MLA Guide on Purdue OWL // MLA Style Guide
Chicago Guide on Purdue OWL // Chicago Style Guide
Bluebook Introduction from Cornell
ACS Guide from Wisconsin
A page on the subject on the Libraries' website.