1Charles H. Kahn, Plato and the Socratic Dialogue: The Philosophical Use of a Literary Form, Cam- bridge University Press, 1996, p. 210.
2M. Gagarin, "The Purpose of Plato's Protagoras", Transactions of the American Philological Association,100 (1969), p. 133.
3J. I_avery, "Plato's Protagoras and the frontier of genre research : a reconnaissance report from the field", Poetics Today 28.2 (2007).
4Robert S. Brumbaugh, Western Philosophic Systems and Their Cyclic Transformations, (1992).
5Robert S. Brumbaugh, "Four Types of Plato Interpretation", in Plato's Dialogues: New Studies and Interpretations, ed. Gerald A. Press, Boston: Rowman and Littlefield. 1993.
6Malcolm Schofleld, "Socratesversus Protagoras", in Barry S. Gower and Michael C. Stokes, eds. , Socratic Questions: New Essays on the Philosophy of Socrates, London: Routledge, 1992, p. 122.
7Plato, Protagoras, translated by Stanley Lombardo and Karen Bell, in Plato: Complete Works; Cooper, JM, Hutchinson, DS, Eds. ; Hackett Publishing Company: Indianapolis, 1997.
8Roger Duncan, "Courage in Plato's Protagoras", Phronesis 23 (3) , 1978, p. 217.
9Roslyn Weiss, "Courage, Confidence and Wisdom in the Protagoras", Ancient Philosophy 5 ( 1 ) : 11 -24, 1985.
10G. Vlastos, "The Unity of the Virtues in theProtagoras", Review of Metaphysics 25 ( 1972 ) pp. 415 - 58 ; T. Penner, "The Unity of Virtue", Philosophi- cal Review 82 (1973) pp. 35 -68.
