Cita de Tilling, Topinka, and Swanson, 1990, Eruptions of Mount St. Helens: Past, Present, and Future: USGS General Interest Publication en Pyroclastic Flows and Pyroclastic Surges, USGS. Revisado el 5 de octubre de 2011.
Cita de Myers and Brantley, 1995, Volcano Hazards Fact Sheet: Hazardous Phenomena at Volcanoes, USGS Open-File Report 95-231. en Pyroclastic Flows and Pyroclastic Surges, USGS. Revisado el 5 de octubre de 2011.
Cita de Hoblitt, Miller, and Scott, 1987, Volcanic Hazards with Regard to Siting Nuclear-Power Plants in the Pacific Northwest, USGS Open-File Report 87-297 en Pyroclastic Flows and Pyroclastic Surges, USGS. Revisado el 5 de octubre de 2011.