Use software like EndNote and Zotero to manage your sources - download citations from library databases; export the bibliography into your paper. Compare the features of some different citation manager programs here.
EndNote is a free download for GSU students, faculty and staff. It's a desktop application that runs on Windows or MacOS.
Zotero is a free Firefox plugin that easily saves citations from GIL and most library databases, as well as sites like Amazon and the New York Times online.
Both programs have Word plugins that automatically create bibliographies in the style of your choice.