1
Grube GMA, Plato. The Republic. Indianapolis, Indiana: : Hackett Publishing Company 1992. https://ebookcentral.proquest.com/lib/gla/detail.action?docID=735561
2
Driver J. Ethics: the fundamentals. Malden, Massachusetts: : Blackwell Publishing 2006. https://ebookcentral.proquest.com/lib/gla/detail.action?docID=1204064
3
Rowe CJ, Broadie S, Aristotle. Nicomachean ethics. Oxford: : Oxford University Press 2002.
4
Taylor CCW, Plato. Protagoras. Oxford: : Oxford University Press 2002.