1. Ethology and ecology of sleep in monkeys and apes. Advances in the study of behavior (in press).
2. Baboon mothers and infants. Cambridge, MA, Harvard University Press, 1980.
3. Baboons, Space, Time, and Energy
4. ; Baboon ecology. Basel, Karger, 1970.
5. Sleep in primates, pp. 308-315 in Medical primatology 1970. ; eds. Basel, Karger, 1971.