1. Ancuţa, R., O. Daniel, and R. Paulică. 2007. Analysis of the landslide movements. International Journal of Geology 1 (3): 70–79.
2. Bell, F.G. 2007. Engineering geology. 2nd ed, 207–248. London: Elsevier.
3. Benkhelil, J. 1989. The origin and evolution of the cretaceous Benue trough (Nigeria). Journal of African Earth Sciences 8: 251–282.
4. Brand, E.W., J. Premchitt, and H.B. Phillipson. 1984. Relationship between rainfall and landslides. In Proceedings of the 4th inter-national symposium on landslides, vol. 1, 377–384. Toronto: BiTech publishers, Vancouver, B.C.
5. British Standards 1377. 1990. Methods of testing soil for civil engineering purposes, 1990. London: British Standards Institute.