The Girard School and most social science sciences courses use the APA style for citing sources, from the American Psychology Association. Choose the most recent 7th edition when given a choice using library databases or citation tools. 

Below are sources with tips for citing sources in APA style.  See McQuade's "How to Cite Sources" for more citation tools.

Use a Reference Manager to keep track of all the references you use for writing papers.  A reference manager will also format your bibliography in the style of your choice.