With some sources, credibility and trustworthiness is easy to determine. With others, it's not so easy. This page will give you some advice and tools you can use to make a determination of a source's trustworthiness. Remember that if you are in doubt, you can always reach out to a friendly librarian for assistance.
Who wrote it?
How can I confirm what they are saying?
Librarians and other information professionals have come up with many tests over the years to try and help students and other researchers determine credibility. While these is no test that can be 100% accurate, these resources can still help you determine whether or not a source is trustworthy.