1. Center for the Study of language and information lecture notes no. 86;WY Adams,1998
2. Axelrod, R. (1984). The evolution of cooperation. Basic Books.
3. Bettinger, R. L. (1998). Comment on M. Rosenberg, “Cheating at Musical Chairs: Sedentism in an Evolutionary Context”. Current Anthropology, 39, 665–666.
4. Birch, J. (2017). The philosophy of social evolution. Oxford University Press.
5. Boehm, C. (1999). Hierarchy in the forest: The evolution of egalitarian behavior. Harvard University Press.