Schuster, Robert L. and Highland, Lynn M. (2001). Socioeconomic and Environmental Impacts of Landslides in the Western Hemisphere, U.S. Geological Survey Open-File Report 01-0276. Also previously published in the Proceedings of the Third Panamerican Symposium on Landslides, July 29 to August 3, 2001, Cartagena, Colombia. Castaneda Martinez, Jorge E., and Olarte Montero, Juan, eds. Retrieved June 11, 2010.
