1. Ali, S. Pastoral System of Ethiopia and Sustainable Development: The Case of Afar in the Awash Valley of Ethiopia. Paper presented at PINEP Reponal Woriahop, Jan 16-19, 1995. Kenya (1995).
2. Brown, D. and Wint, W. Livestock, Land Use and Agricultural Intensification in Sub-Saharan Africa. Pastoral Development Network Paper 37a, ODI. London (1994).
3. Coppock, D.L. The Borana Plateau of Southern Ethiopia: Synthesis of Pastoral Research. Development and Change. 1980-9I ILCA (International Livestock Centre for Africa), Addis Ababa. Ethiopia (1994).
4. Direse, T.A., Farah, K.O. and Mbuvi, D.M. Impact of Land use Practices on Woody Vegetation Resources in the semiarid Area of Aba ala District. North Afar. Ethiopiaa. The African Pastoral Forum Working Papar Series o. 16. Department of Range Management. University of Nairobi, Kenya (1998).
5. Fanth. K O : Natural vegetation. In:Environmental Change and Dry land Management in Machahos District. Kenya 1930-1990 ODI Working Paper No 53. ODI. London (1991).