Not all information resources are created equal! Be sure you think about what kind of information you are using. Some quick guidelines:
See the Penn State University Library's Evaluating Information page for more information about how to ask and answer the above questions, and their Evaluating Information Rubric for tips on what to look for in books, periodicals, and web sites.
NCSU Libraries also have a Peer Review in Three Minutes video that does an excellent (and entertaining) job of explaining peer review.