1. Bos M.G. & Nugteren J. 1974. (3rd edition 1982), On Irrigation Efficiencies. Publication 19, ILRI, Wageningen, The Netherlands.
2. Bos M.G. 1980. Irrigation efficiencies at crop production level. ICID Bulletin Vol. 29, 2: 18?26, New Delhi.
3. Duane P. 1987. Cost Recovery in Irrigation Projects: Perceptions from World Bank Operations. In: Technical Papers from the Expert Consultation on Irrigation Water Charges, Vol. I, FAO/USAID, Rome.
4. ECIWC, 1986. Report on the Expert Consultation on Irrigation Water Charges. FAO/USAID, Rome.
5. ICID, 1978. Standards for the calculation of irrigation efficiencies. ICID Bulletin Vol. 27, 1: 91?101, New Delhi.