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Cosmos of the Ancients: Prodicus of Ceos
http://www.stenudd.com/myth/greek/prodicus.htm
Concise article on this thinker, by Stefan Stenudd.
Hellenicdata: Prodicus
http://kat.gr/kat/History/Txt/Prodicus.htm
Concise encyclopedia article on this ancient rhetorician.
Internet Encyclopedia of Philosophy: Prodicus
http://www.iep.utm.edu/p/prodicus.htm
Short article on this leading Sophist.
Plato and His Dialogues: Prodicus of Ceos
http://plato-dialogues.org/tools/char/prodicus.htm
A resource provided by the Perseus Project, with links to every mention of this Sophist in Plato's dialogues.
Wikipedia: Prodicus
http://www.wikipedia.org/wiki/Prodicus
Article incorporating information from the 1911 Encyclopaedia Britannica.