1. Akerlof, A. (1970). The market for lemons: Quality uncertainty and the market mechanism. In: Quarterly Journal of Economics, 84 (3), 488–500.
2. Axelrod, R. (1984). The Evolution of Co-operation. Penguin Books, Harmonsdsworth.
3. Axelrod, R. (1986). An evolutionary approach to norms. In: American Political Science Review, 4, 1093–1111.
4. Axelrod, R. (1997). The complexity of cooperation. Princeton University Press, Princeton, NJ. Axelrod, R. and Dion, D. (1988), The further evolution of cooperation. In: Nature, 242, 1395–1390.
5. Bicchieri, C. (1990). Norms of cooperation. In: Ethics, 100, 838–861.