Antiphon
Links
MacTutor History of Mathematics: Antiphon the Sophist
http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Antiphon.html
Article on this ancient thinker or thinkers, with bibliography and cross-references.
The Internet Classics Archive: Works by Antiphon
http://classics.mit.edu/Browse/browse-Antiphon.html
Online texts of Antiphon's speeches, in Greek and English.