1. The tragedy of the commons;Hardin;Science,1968
2. Lloyd, W.F. (1833) Two Lectures on the Checks to Population, Reprinted by Augustus M. Kelly
3. The Natural Regulation of Animal Numbers;Lack,1954
4. Adaptation and Natural Selection: a Critique of Some Current Evolutionary Thought;Williams,1966
5. The Selfish Gene;Dawkins,1976