1. Characterizing soils of DelboWegen watershed, Wolaita Zone, southern Ethiopia, for planning appropriate land management;Ali;J. Soil Sci. Environ. Manage.,2010
2. Land Degradation: Development and Break-down of Terrestrial Environments;Barrow,1991
3. Soil characterization along toposequence in Gununo area, southern Ethiopia;Sheleme;J. Sci. Dev.,2011
4. The Nature and Properties of Soils;Brady,2002
5. Methods of soil analysis, part two;Bremner,1982