1. Abdullah, W.A. , Mollah, M.A., Detection and treatment of karst cavities in Kuwait. In: Beck, B.F., Pettit, A.J. & Herring, J.G. (eds) Hydrology and Engineering Geology of Sinkholes and Karst., 1999. 123–127 Balkema, Rotterdam.
2. The description and classificatioin of weathered rocks for engineering purposes
3. Engineering classification of rock masses for the design of tunnel support
4. Beck, B.F. , Sinclair, W.C., Sinkholes in Florida: an introduction. Institute Report 85-86-4 1986. Florida Sinkhole Research.
5. Bell, F.G. , Culshaw, M.G., Waltham, A.C., Sinkholes and subsidence., 2003. Praxis, Chichester.