1. Some aspects of climate variability in the north east Ethiopian highlands - Wollo and Tigray
2. Over one century of rainfall and temperature observations in Addis Ababa, Ethiopia
3. 1994. Rethinking Ethiopia. In The Horn of Africa, (ed). UCL Press: London; 25–46.
4. 1997. Demographic Responses to Ecological Degradation and Food Insecurity: Drought Prone Areas in Northern Ethiopia. PDOD Publications: Amsterdam.
5. FDRE (Federal Democratic Republic of Ethiopia). 1997a. The Conservation Strategy of Ethiopia: The Resources Base, Its Utilization and Planning for Sustainability, Vol. I. Environmental Protection Authority in collaboration with the Ministry of Economic Development and Cooperation: Addis Ababa.