http://citationmachine.net/
Examples from the Chicago Manual of Style Citation Guide from Ohio State University Libraries.
http://library.osu.edu/sites/guides/chicagogd.html
A Research Guide for Students. Includes links to all the different style guides as well as many other research-related formats.
http://www.aresearchguide.com/styleguides.html
APA Research Style Crib Sheet - standard formats for bibliographies, footnotes and reference lists - in pdf format.
http://www.docstyles.com/archive/apacrib.pdf
NoodleBib user's guide is available at the following pdf link:
http://www.noodletools.com/tools/noodlebib_users_guide.pdf