1. Aristotle. (1998). Politics (C. D. C. Reeve, Trans.). Indianapolis, IN: Hackett.
2. Barber, A. (2013). Science’s immunity to moral refuation. Australasian Journal of Philosophy, 91(4), 633–653. doi: 10.1080/00048402.2013.768279 .
3. Barnes, J. (2001). Early greek philosophy (2nd ed.). London: Penguin Books.
4. [Bible, Hebrew] Tanach. (1996). (2nd ed., Scherman, N., Ed.) New York: Mesorah.
5. Block, N. J., & Dworkin, G. (1974). IQ, heritability and inequality, part 2. Philosophy & Public Affairs, 4(1), 40–99.