1. Concealment of ovulation, parental care, and human social evolution;Alexander,1979
2. Primate tool behavior;Beck,1975
3. Fishing and hunting by the Bari of Colombia;Beckerman;Working Papers on South American Indians,1980
4. Beckerman, S. (in press). Carpe Diem: An optimal foraging approach to Bari fishing and hunting patterns. In (R. Hames & W. Vickers, Eds) Adaptive Responses of Native Americans. New York: Academic Press.