1. Beauchamp, T. L. and Childress, J. F. (1979).Principles of Bio-medical Ethics, ch. 3–6, Oxford University Press, New York.
2. Noddings, N. (1984).Caring: A Feminine Approach to Ethics and Moral Education, University of California Press, Berkeley and Los Angeles.
3. Rawls, J. (1971).A Theory of Justice, ch. 11, Oxford University Press, Oxford.
4. Nozick, R. (1974).Anarchy, State and Utopia, ch. 4, Basic Books, New York.
5. Aristotle,Nicomachean Ethics, 1095a16–20.