This short video explains several things to keep in mind when choosing information sources for research. (Video by NCSU Libraries, CC-BY-NC-SA 3.0 US license)
The RADAR Framework can help you remember what kinds of questions to ask about an information source in order to determine its usefulness for your research. (Developed by librarians at Loyola Marymount University)
Rationale - What is the purpose of the information?
Authority - Is the author and publication credible?
Date - Is the information up-to-date relative to the topic at hand?
Accuracy - How correct and truthful is the information?
Relevance - How relevant is this information to your own purposes?