There are a wide range of citation managers that can help you store citations, create bibliographies in the style of your choice, and cite while you write. Those that are supported by Fogler Library include:
Zotero (freely available online, with storage limitations)
Mendeley (freely available online, with storage and user limitations)
EndNoteWeb (basic, free version, with storage limitations)
How to Cite Digitized Primary Sources (Library of Congress) Examples in Chicago and MLA; how to cite electronic reproductions of primary sources, including film, photographs, legal and government publications, maps, recorded sound, text, and other special sources.
Sources and Citations at Dartmouth at (Dartmouth College) Not a style manual per se, but a writer's guide to academic integrity, citing sources, and evaluation of sources.
APA (American Psychological Association)
APA Documentation (University of Wisconsin Writing Center) Choose "APA Table of Contents" (right)
APA Style Guide to Electronic References An e-book which explains how to cite web documents (sometimes with missing elements). Provides examples for citing books, book chapters, journal articles, technical & research reports, conferences, dissertations, data sets, web sites, message boards, electronic mailing lists, and social media.