You need to evaluate!
Evaluating Information Sources
When you're evaluating a web site you found on the Open Web (through Google, Bing, etc.), the first three criteria -- Credibility, Accuracy, and Reliability -- are particularly important.
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Evaluating Information SourcesAn online guide, listing the criteria you should think about before including an information source in an academic paper. These questions are all the more important to ask when you're using a web site you've found through a Google search.