1. A natural history of the senses;Ackerman,1990
2. Primate bio-social development: Biological, social, and ecological determinants,1977
3. The expression of emotion in animals and man;Darwin,1871
4. Intentional systems in cognitive ethology: The panglossian paradigm defended;Dennett;Behavioral and Brain Sciences,1983
5. Peacemaking among primates;De Waal,1989