1. Blouet, B. W., & Blouet, O. M. (2002). Latin America and the Caribbean: A systematic and regional survey. New York: Wiley and Sons.
2. Brown, R. D., Ward, P. L., & Plafker, G. (1973). Geologic and seismologic aspects of the Managua, Nicaragua, earthquake of December 23, 1972. Washington, DC: US Geological Survey Prof. Paper 838.
3. Clawson, D. (2000). Latin America and the Caribbean: Lands and peoples. Boston: McGraw-Hill.
4. Gobierno de El Salvador. (2002). Clearing House. Retrieved June 16, 2003, from the World Wide Web:
http://clearinghouse.cnr.gob.sv/metadatos/index.htm
.
5. IDRISI Project. (1997). Applications of Geographic Information Systems (GIS) technology in environmental risk assessment and management. New York: United Nations Environmental Program Risk Project.