In Defense of Protagoras: Essay asserting that Protagoras has been misconstrued as an individual (or absolute) relativist, and should be considered a "human relativist."
Myth - Protagoras: Review of Protagoras' thoughts on cosmology and the myths. By Swedish author and historian of Ideas Stefan Stenudd.
Protagoras: Two extant fragments from this thinker's teachings.
Protagoras: Short article summarizing this thinker's thought.
Protagoras: Internet Encyclopedia of Philosophy article by Carol Poster. Deals extensively with what we know about the life, doctrines and influence of this Sophist.
Protagoras: Brief Wikipedia article on this thinker, noting his relativistic and agnostic teachings.