The TRAAP Test, below, is one way to evaluate a source. While not all of these will apply to every kind of source (for instance, not all are applicable to a website), using the test is a good way to think critically about the source and the information from the source.
The Traap Test: Evaluating Information
Don’t be trapped by sources--learn how to evaluate them!
(adapted from the Meriam Library, California State University, Chico)
Timeliness: The "newness" of the information