1. Abeynayake, R. 1991. Uva battles South for Uma Oya waters.The Sunday Observer (4 August 1991), Colombo.
2. Abeygunawardana, P. 1988. Financial analysis of farming systems: The Doragala project. Upper Mahaweli Watershed Management Project, Kandy, Sri Lanka.
3. Altieri, M. A. (ed.), 1987. Agroecology: The scientific basis of alternative agriculture. Westview Press, Boulder, Colorado.
4. Bavappa, K. V. A., and V. J. Jacob. 1981. A model for mixed cropping.Ceres 14(3):44–46.
5. Bloch, P. C. 1988. Land tenure issues in Sri Lanka: A brief overview. USAID/Sri Lanka, Office of Food and Agriculture Development, Colombo.