In Defense of Protagoras Essay asserting that Protagoras has been misconstrued as an individual (or absolute) relativist, and should be considered a "human relativist." http://www.geocities.com/inescapableennui/s12.html
Protagoras Internet Encyclopedia of Philosophy article by Carol Poster. Deals extensively with what we know about the life, doctrines and influence of this Sophist. http://www.iep.utm.edu/p/protagor.htm
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