1. Allen RG, Pereira LS, Raes D, Smith M (1998) Crop evapotranspiration: guidelines for computing crop water requirements: FAO Irrigation and Drainage Paper 56, FAO, Rome
2. Aman H (2007) Boru Dodota spate irrigation project, design document. Oromia Water Resources Bureau, Adama, Ethiopia
3. Awulachew SB, Yilma AD, Loulseged M et al (2007) Water resources and irrigation development in Ethiopia. International Water Management Institute (IWMI), Addis Ababa, Ethiopia
4. De Laat PJM (2002) Soil—water—plant relations. Lecture Notes. LN006.08.1, UNESCO-IHE, Delft, the Netherlands
5. De Laat PJM (2007) NAM simplified spreadsheet version instruction manual, UNESCO-IHE, Delft, the Netherlands