1. Eroded savannah soils of the Navrongo–Bawku area, Upper region of Ghana;Adu;Ghana Journal of Agricultural Science,1972
2. Arc/Info Version 7.04,1996
3. Soils and Soil Degradation of the Upper East Region of Ghana;Asiamah,1992
4. Soils of Ghana: A Special Report on Result of Analysis of Samples Collected from the 10 Regions;Berhe,1993
5. Soil characteristic and aggregate stability;Bissonais,1996