1. Delgado, C., Rosegrant, M., Steinfeld, H., Ehui, S., Courbois, C., 1999. Livestock to 2020. The next food revolution. Food, Agriculture, and the Environment Discussion Paper 28. IFPRI/FAO/ILRI. International Food Policy Research Institute, Washington, DC, 72 pp.
2. Crop–animal interactions in mixed farming systems;Devendra;Agric. Syst.,2002
3. Douthwaite, B., 2002. Enabling Innovation: A Practical Guide to Understanding and Fostering Technological Change. Zed Books, London, 266 pp.
4. Kristjanson, P., Tarawali, S., Okike, I., Singh, B.B., Thornton, P.K., Manyong, V.M., Kruska, R.L., Hoogenboom, G., 2002. Genetically improved dual-purpose cowpea: assessment of adoption and impact in the dry savannah of West Africa. Impact Assessment Series No. 9. ILRI, Nairobi, Kenya, 67 pp.
5. Kristjianson, P.M., Zerbini, E., 1999. Genetic enhancement of sorghum and millet residues fed to ruminants. ILRI Impact Assessment Series 3. ILRI, Nairobi, Kenya, 44 pp.