Provided here are a list of additional websites that you may find useful.
Evaluating Web Pages from the University of Berkeley Libraries. Another excellent resource for help in determining if a site is credible.
Evaluating During Reading from Purdue University's Online Writing Lab. Offers great tips on things to consider when reading a source to determine if it is credible.
The three Learning about Information tutorials from the University of Oklahoma libraries provide tutorials on how to evaluate your information needs, evaluate an information source, and understand scholarly information.