1. Predation and primate evolution
2. (1981) Observações sobre a ecologia e o comportamento dos cuxiús (Chiropotes albinasus e Chiropotes satanas, Cebidae. Primates). Manaus, Brazil: Instituto Nacional de Pesquisas da Amazônia (INPA).
3. (1986) Uakaris and Amazonian flooded forest. Ph.D. Dissertation, University of Cambridge.
4. (1977) The Langurs of Abu: Female and Male Strategies of Reproduction. Cambridge: Harvard University Press.
5. Mating patterns in squirrel monkeys (Saimiri oerstedi)