The following are resources on writing an annotated bibliography.
From Purdue Online Writing Lab (highly recommended!):
http://owl.english.purdue.edu/owl/resource/614/1/
How to Prepare an Annotated Bibliography from Cornell:
http://olinuris.library.cornell.edu/ref/research/skill28.htm
Here's a 6 minute video: How to Write an Annotated Bibliography:
http://www.umuc.edu/library/libhow/bibliography_tutorial.cfm