1. Aristotle (1998) Politics. Hackett Publishing Company, Indianapolis and Cambridge
2. Axelrod R (1984) Evolution of cooperation. Basic Books, New York
3. Bailey JW (1997) Utilitarianism, institutions, and justice. Oxford University Press, New York and Oxford
4. Bentham J (1907) An introduction to the principles of morals and legislation. Clarendon Press, Oxford
5. Bentham J (1990) A fragment on government. Cambridge University Press, Cambridge