Gaya APA

Wright, T, L. (1992). Living with Volcanoes : The U.S. Geological Survey's Volcano Hazards Program . Washington DC: United States Government Printing Office.

Gaya MLA

Wright, Thomas, L.. "Living with Volcanoes : The U.S. Geological Survey's Volcano Hazards Program". Washington DC: United States Government Printing Office, 1992. Text.