Purdue OWL - Purdue Online Writing Lab - Purdue University
The Online Writing Lab (OWL) at Purdue University houses writing resources and instructional material
Research Documentatation, 5th ed.
Provides examples of in-text citations (such as direct quotations), as well as examples of footnotes, endnotes, and references/works cited lists in Chicago, APA, and MLA styles.
From SU Libraries: Easybib Academic Edition
Easybib is nice, but you always have the most control over the accuracy of your citations when you do it by hand using the selected style manual (below).