The CRAAP Test provides a good guide for analyzing your research sources. Here is a link to an accessible PDF of this information.
45-50 Excellent | 40-44 Good | 35-39 Average | 30-34 Borderline | Below 30-Unacceptable
This information has been adapted from "Evaluating Information-Applying the CRAAP Test" by the staff at Meriam Library, California State University-Chico. The source material can be accessed here.
"Evaluating Information-Applying the CRAAP Test." 26 Sept. 2009. Meriam Lib., California State University-Chico. CSU-Chico ReSEARCH Station. Web. 11 Jan. 2010.