1. An Inquiry into the Nature and Causes of the Wealth of Nations;Smith,1776
2. The Theory of Moral Sentiments;Smith,1759
3. Mathematical Psychics: An Essay on the Application of Mathematics to the Moral Sciences;Edgeworth,1881
4. Edgeworth's Propositions on Altruism
5. Altruism, Egoism, and Genetic Fitness: Economics and Sociobiology;Becker;J. Econ. Lit.,1976