No matter how good or precise your search for resources is, you are going to have to evaluate the results that you get back to figure out if they work for you. We need to ask several questions of any resource before we are ready to use it to back up a point. Who wrote it? Where did they get that information? What are they trying to get do with it? Are they trying to sway you to a certain belief? Who are they targeting?
Below are four infographics to help you approach some of those questions.