1. (1989) Social suppression of reproduction in primates. In and (eds): Comparative Socioecology: The Behavioural Ecology of Humans and Other Mammals. Oxford: Blackwell Scientific, pp. 285-304.
2. (1984) On Socialization in Hamadryas Baboons. Cranbury, N.J.: Associated University Presses.
3. and (1979) Concealment of ovulation, parental care, and human social evolution. In and (eds.): Evolutionary Biology and Human Social Behavior. North Scituate, Mass.: Duxbury, pp. 436-453.
4. , , , and (1979) Sexual dimorphisms and breeding systems in pinnipeds, ungulates, primates, and humans. In and (eds.): Evolutionary Biology and Human Social Behavior: An Anthropological Perspective. North Scituate, Mass.: Duxbury, pp. 402-435.
5. Observational Study of Behavior: Sampling Methods