1. Aristotle (1962). The politics (T.A. Sinclair, Trans. and Intro.). Baltimore, MD: Penguin Books.
2. Aristotle (1976). The ethics of Aristotle: The Nichomachean ethics (J.A.K. Thomson, Trans.; H. Tredennick, Rev. Trans.; J. Barnes, Intro.) Harmondsworth: Penguin.
3. Aristotle (1991). The art of rhetoric (H.C. Lawson-Tancred, Trans., Intro. and Notes). London: Penguin Books.
4. Confucius (1971). The analects (Lun Yu), The great learning (Da Xue), The doctrine of the mean (Zhong Yong) (J. Legge, Trans). London: Dover Publications.