1. Admassie, Y., 1995. Twenty years to nowhere. Property rights, land management, and conservation in Ethiopia, Ph.D. thesis, Uppsala University, Sweden.
2. Women: key actors in implementation of soil conservation activities;Akerman;Svensk Geografisk Arsbok,1995
3. Alemu, T., 1999. Land tenure and soil conservation: evidence from Ethiopia, Ph. D. thesis, Göteborg University, Sweden.
4. Anderson, R.J., Thampapillai, J., 1990. Soil conservation in developing countries: Project and policy intervention, Policy and Research Series No. 8, Agriculture and Rural Development Department, The World Bank, Washington, DC.
5. The “flexibility” of indigenous soil and water conservation techniques: a case study of the Hararghe Highlands, Ethiopia;Asrat,1996