1. Bekoff, M., and J. A. Byers 1981 A Critical Reanalysis of the Ontogeny and Phylogeny of Mammalian Social and Locomotor Play: An Ethological Hornet’s Nest. In Behavioral Development, K Immelmann, G. W. Barlow, L. Petrinovich, and M. Main, eds. Pp. 296–336. London: Cambridge University Press.
2. Blurton Jones, N. 1993 The Lives of Hunter-Gatherer Children: Effects of Parental Behavior and Parental Reproductive Strategy. In Juvenile Primates, M. E. Pereira and L. A. Fairbanks, eds. Pp. 309–326. New York: Oxford.
3. Blurton Jones, N. G., K. Hawkes, and J. F. O’Connell 1999 Some Current Ideas about the Evolution of the Human Life History. In Comparative Primate Socioecology, P. C. Lee, ed. Pp. 140–166. New York: Cambridge University Press.
4. Bock, J. 1995 The Determinants of Variation in Children’s Activities in a Southern African Community. Ph.D. Dissertation, Department of Anthropology, University of New Mexico, Albuquerque.
5. 1998 Economic Development and Cultural Change among the Okavango Delta Peoples of Botswana. Botswana Notes and Records 30:27–44.