In order to organize and manage your citations, consider using a Citation Manager like Zotero. More information on Zotero and other citation managers can be found on the Citation Managers Guide.
Below are resources that can help you when you're formatting your bibliography and papers in MLA or Chicago style. Some professors (or publishers, if you are writing an article to be published) may prefer a different style, such as APA, so always check before you format and submit your work. Ask a librarian if you have questions about MLA, Chicago. or other citation styles.