This document discusses how to evaluate the credibility of sources for research. It defines a credible source as one that can be trusted, is agreed upon by other sources, is up-to-date, comes from a respected author or organization, provides clear information about the author/organization, and is not biased. It notes that Wikipedia can be edited by anyone so its accuracy cannot be guaranteed, while .edu, .org, and .gov websites tend to be more credible. It provides tips for evaluating sources like checking copyright dates, references, and professionalism of the website.