1. Abbe, C. (1889) Is our climate changing? Forum. 6, 678–688.
2. Allan, W. (1965) The African Husbandman. London, Oliver and Boyd Ltd.
3. Allee, W. C., Emerson, A. E., Park, O., Park, T. and Schmidt, K. P. (1949) Principles of Animal Ecology. Philadelphia, W. B. Saunders Company.
4. ——— and May R. M. (1991) Infectious Disease of Humans Dynamics and Control. Oxford, Oxford University Press.
5. ——— (1959a) The Tinde experiment: a further study of the long-term cyclical transmission of T. Rhodesiense. Ann. trop. Med. Parasit. 53, 137–146.