1. The Varnes classification of landside types, an update;Hungr;Landslides,2013
2. Rockfall Characterization and Control;Turner;TR News,2013
3. Hoek, E. (2007). Practical Rock Engineering, Association of Environmental & Engineering Geologists.
4. Stead, D., Eberhardt, E., Coggan, J., and Benko, B. (2001, January 17). Advanced Numerical Techniques in Rock Slope Stability Analysis—Applications and Limitations. Proceedings of the UEF International Conference on Landslides—Causes, Impacts and Countermeasures, Davos, Switzerland.
5. Strength of Rock and Rock Masses;Hoek;Int. Soc. Rock Mech. News J.,1994