Dawkins, R. (1976) The Selfish Gene. New York: Oxford University Press.
2.
Hamilton, W.D. (1964) “The Genetical Evolution of Social Behavior”, Journal of Theoretical Biology7: 1-52.
3.
Hollis, A.C. (1905) The Maasai: Their Language and Folklore. Oxford: Clarendon.
4.
Jacobs, A.H. (1965) “The Traditional Political Organization of the Pastoral Masai”, Micofilm Copy of Oxford University thesis. Urbana, University of Illinois.
5.
Massek, A.O. and Sidai, J.O. (1974) Wisdom of Maasai. Nairobi: Transafrica.
6.
Rainy, M.E. (1973) “Highland Plains Zebra Population Dynamics and Relation to Social Structure and Environment”, Paper presented at the Serengeti Symposium on Large Mammal Populations.
7.
Spencer, P. (1965) The Samburu, A Study of Gerontocracy in a Nomadic Tribe. London: Routledge and Kegan Paul.
8.
Spencer, P. (1973) Nomads in Alliance. London: Oxford University Press.
9.
Turner, V.W. (1969) The Ritual Process: Structure and Anti-Structure. London: Routledge and Kegan Paul.
10.
Washburn, S. and Jay, P. (eds) (1968) Perspectives on Human Evolution. New York: Holt, Rinehart and Winston.
11.
Western, D. and Finch, V. (1986) “Cattle and Pastoralism: Survival and Production in Arid Lands”, Human Ecology14(1): 77-94.
12.
Wilson, E.O. (1975) Sociobiology. Cambridge: Harvard University Press.