1. BAUCHOP, T. 1978. Digestion of leaves in vertebrate arboreal folivores. In: The ecology of arboreal folivores. (Ed.) Montgomery, G.G. Smithsonian Institution Press, Washington D.C.
2. CROSS, R.H.M. 1979. The preparation of biological material for electron microscopy. Unpublished manual of the Rhodes University Electron Microscope Unit.
3. DE GRAAFF, G. 1981. The rodents of southern Africa. Butterworths, Durban.
4. HOFMANN, R.R. 1973. The ruminant stomach. East African Literature Bureau, Nairobi.
5. HUMASON, G.L. 1967. Animal tissue techniques. Freeman & Co., San Francisco.