1. Adam Smith, An Inquiry into the Nature and Causes of The Wealth of Nations
2. (Digireads.com ebook, 2009), 12.
3. Aristotle, Nicomachean Ethics , Book 1:2 (ca. 325 bce).
4. Baruch Spinoza, Ethica (1677)
5. Bernard Hodgson's Economics as Moral Science (New York: Springer-Verlag, 2001)