1. Age cohorts as paternal sibships
2. (1975) Basic data and concepts on the social organization of Macaca fascicularis. In (ed.): Primate Behavior. Developments in Field and Laboratory Research. 4. New York: Academic, pp. 325-388.
3. Kin-oriented redirection among Japanese macaques: an expression of a revenge system?
4. (1984) The Evolution of Cooperation. New York: Basic.
5. The Evolution of Cooperation