1. Allen, R.E. 1970. Plato’s Euthyphro and the Earlier Theory of Forms. New York: Humanity Press.
2. Barnes, J. 1984. The Complete Works of Aristotle. Vol. 1 and 2. Princeton University Press.
3. Brickhouse, T.C., and N.D. Smith. 1994. Plato’s Socrates. Oxford University Press.
4. ———. 1997. Socrates and the Unity of Virtues. The Journal of Ethics 4: 311–324.
5. ———. 2010. Socratic Moral Psychology. New York: Cambridge University Press.