Critical Evaluation of Resources (Univ. of California Berkeley) - Covers scholarly vs. popular publications, primary vs secondary resources, authority, documentation.
Evaluating Web Pages: Techniques to Apply and Questions to Ask (Univ. of California Berkeley).
Using Primary Sources on the Web: Evaluating Primary Source Websites (American Library Association)
Document Analysis Worksheets (National Archives)
Guide to analyzing various kinds of primary sources - written documents, photographs, cartoons, posters, maps, artifacts, motion pictures, and sound recordings.