1. Low head drip irrigation kits and treadle pumps for smallholder farmers in Zimbabwe—a technical evaluation based on laboratory tests;Chigerwe;Physics and Chemistry of the Earth,2003
2. An introduction to low cost drip irrigation for small scale farmers;Daka,1999
3. FAO, 2003. Food and Agriculture Organization Irrigation Manual, second ed. Rome, Italy.
4. The sensitivity of parameters in the Penman evaporation e.g. nations and direct recharge balance;Howard;Journal of Hydrology,1979
5. Keller, J., 1990. Modern irrigation in developing countries. In: Proceedings of the 14th International Congress on Irrigation and Drainage. Rio de Janeiro, Argentine, April–May 1990. International Congress on Irrigation and Drainage, Chanakyapuri, New Delhi, India.