1. Ayers, R. S. & Wescot, D. W. (1985). Water quality for agriculture. FAO Irrigation and Drainage Paper No. 29 (Rev. 1), FAO of the United Nations, Rome, 3–53.
2. Re-utilization of drainage water in Al-Hassa Oasis;Bureau de Recherches Geologiques et Minieres (BRGM),1981
3. Crop water requirements;Doorenbos,1984
4. Yield response to water;Doorenbos,1986
5. Hofuf Agricultural Research Centre (1976). Irrigation handbook. Report on the work of Leichtweiss Institute Research Team. Technical University Braunschweig Publication No. 17, Hofuf, Saudi Arabia, 6–62.