Richard D. Alexander


, 1981a, Evolution, social behavior, and ethics, in D. Callahan & T. Engelhardt (eds.), The roots of ethics, Dordrecht, Springer, pp. 307-338.

, 1981b, Natural selection and societal laws, in D. Callahan & T. Engelhardt (eds.), The roots of ethics, Dordrecht, Springer, pp. 265-306.