1. Ambenje, P.G., 2000. Eastern and Southern Africa Drought Monitoring Centre, Nairobi, Kenya. In Proceedings of an Expert Group Meeting held September 5–7, 2000, on Early Warning Systems for Drought Preparedness and Drought Management in Lisbon, Portugal, WMO/TD No. 1037.
2. Understanding the causes of African famine;Ball;The Journal of Modern African Studies,1976
3. Barron, J., 2004. Dry spell mitigation to upgrade semi-arid rainfed agriculture: water harvesting and soil nutrient management for smallholder maize cultivation in Machakos, Kenya. Doctoral thesis in Natural Resource Management, Department of Systems Ecology, Stockholm University, S-106 91 Stockholm, Sweden.
4. Berger, P., 1989. Rainfall and Agroclimatology of the Laikipia Plateau, Kenya. In: African Studies Series A7, Geographica Bernensia, Institute of Geography, University of Berne, Switzerland.
5. At Risk: Natural Hazards, People's Vulnerability, and Disasters;Blaikie,1994