Tolong jelaskan mengenai Pustaka lanjutan dari Sofistes

Corey, D. 2002. "The Case against Teaching Virtue for Pay: Socrates and the Sophists." History of Political Thought 23:189–210.

Dillon, J., and T. Gergel. 2003. The Greek Sophists. London: Penguin.

Gibert, J. 2002. "The Sophists." In The Blackwell Guide to Ancient Philosophy. Edited by C. Shields, 27–50. Oxford: Blackwell.

Montiglio, S. 2000. "Wandering Philosophers in Classical Greece." Journal of Hellenic Studies 120:86–105.

Robinson, E. 2007. "The Sophists and Democracy beyond Athens." Rhetorica 25:109–122.