1. Alexander, J. (1988). The Saharan divide in the Nile Valley: the evidence from Quasr Ibrim. Afr. Arch. Rev. 6, 73–90.
2. Alexander, K.A. and M.J.G. Appel (1994). African wild dogs (Lyacon pictus) endangered by a Canine Distemper epizootic among domestic dogs near the Masai Mara National reserve, Kenya. J. Vet. Diseases 30, 481–485.
3. Bailey, T.N. (1993). The African Leopard: Ecology and Behavior of a Solitary Felid. Colombia University Press, New York.
4. Barnard, A. (1992). Hunters and Herders of Southern Africa: a Comparative Ethnography of the Khoisan peoples. Cambridge Universty Press, Cambridge.
5. Bell, R.H.V. (1971). A grazing ecosystem in the Serengeti. Sd. Am. 224(1), 86–93.