Robert H. Johns and Jeffry S. Evans. Storm Prediction Center. Derecho Facts.Archivado el 27 de mayo de 2010 en Wayback Machine. Retrieved on 2006-11-19.
crh.noaa.gov
National Weather Service Forecast Office, Springfield, Missouri. Storm Spotter Online Training. Retrieved on 2006-11-19.
Robert H. Johns and Jeffry S. Evans. Storm Prediction Center. Derecho Facts.Archivado el 27 de mayo de 2010 en Wayback Machine. Retrieved on 2006-11-19.