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The Modern Language Association (MLA) style is designed for the humanities. Printed copies of the MLA Handbook are located in the citation manual collection by the reference desk (Call number: Reference LB2369.G53 2003).
Different disciplines use different citation styles; if you don't know which style to use, ask your professor. This library guide provides examples of various styles; printed style guides are located next to the reference desk in the Hatfield Library.
Zotero is a free, open source browser app that collects, manages, cites, and shares your research sources. It lives right in your web browser, and has a similar design to the iTunes library.