1. Group Selection, Altruism, and the Levels of Organization of Life;Alexander;Annual Review of Ecological Systematics,1978
2. Principles of Animal Ecology;Allee,1949
3. Social Evolution in Ants;Bourke,1995
4. Culture and the Evolutionary Process;Boyd,1985
5. Not By Genes Alone: How Culture Transformed Human Evolution;Boyd,2004