Press Shaver, Robert (1998). Rational Egoism: A Selective and Critical History. Cambridge University Press. Shaver, Robert (2002). "Egoism". The Stanford Encyclopedia of Philosophy (Winter Edition), Edward N. Zalta (ed.). link Sigwick, H., The Methods of Ethics. London, 1874, 7th ed. 1907. Smith, Tara (2006). Ayn Rand's Normative Ethics. Cambridge University Press. Sober, E. & D.S. Wilson (1998). Unto Others: The Evolution and Psychology of Unselfish Behavior. Harvard University Press. External links Egoism in the Internet Encyclopedia of Philosophy Egoism in the Stanford Encyclopedia of Philosophy The Red/Black Game Egoism Capitalism Rationalism Rational choice theory Philosophy of life