How do I write an annotated bibliography?

Get your citations then right next to write what you used it for, how good of a source it was, etc. Make sure it's indented.

Ex:

"McCarthyism." Arthur Miller, Joseph McCarthy, and the Salem Witch Trials: Context in The Crucible. N. p., n. d. Web. 09 June 2015. This source was very useful for finding information on McCarthyism during the 1950s. Most of the information used in this essay was from this source.

First, locate and record citations to books, periodicals, and documents that may contain useful information and ideas on your topic. Briefly examine and review the actual items. Then choose those works that provide a variety of perspectives on your topic.

Cite the book, article, or document using the appropriate style.

Write a concise annotation that summarizes the central theme and scope of the book or article. Include one or more sentences that (a) evaluate the authority or background of the author, (b) comment on the intended audience, (c) compare or contrast this work with another you have cited, or (d) explain how this work illuminates your bibliography topic.