Driver, Julia. Ethics: The Fundamentals. Blackwell Publishing, 2006, https://ebookcentral.proquest.com/lib/gla/detail.action?docID=1204064.
Grube, G. M. A. and Plato. The Republic. Edited by C. D. C. Reeve, Hackett Publishing Company, 1992, https://ebookcentral.proquest.com/lib/gla/detail.action?docID=735561.
Rowe, C. J., et al. Nicomachean Ethics. Oxford University Press, 2002.
Taylor, C. C. W. and Plato. Protagoras. Oxford University Press, 2002.