1. Abdulkadir B, Kassa S, Desalegn T, Tadesse K, Yohalashet M, Fana G, Abera T, Amede T, Degefie DT. 2017. Crop response to fertiliser application in Ethiopia: a review. In: Lulseged T, Tilahun A, Job K, Degefie T, Steffen S (eds), A review of soil fertility management and crop response to fertiliser application in Ethiopia: Towards development of site- and context-specific fertiliser recommendation. Addis Ababa, Ethiopia: International Center for Tropical Agriculture (CIAT). p. 86.
2. Assessment of the limiting nutrients for wheat(Triticum aestivumL.) growth using Diagnosis and Recommendation Integrated System (DRIS)
3. Methods of Soil Analysis
4. CIMMYT 1988. From agronomic data to farmer recommendations: An Economics Training Manual. International Maize and Wheat Improvement Centre (CIMMYT), Mexico.
5. CSA 2018a. Agricultural sample survey on area and production of major crops in Ethiopia (Statistical bulletin). Addis Ababa, Ethiopia: Central Statistical Agency (CSA).