Keller, E. A., DeVecchio, D. E., & Blodgett, R. H. Natural hazards: Earth's processes as hazards, disasters, and catastrophes (3rd ed.).
Chicago-referens (17:e uppl.)Keller, Edward A., Duane E. DeVecchio, och Robert H. Blodgett. Natural Hazards: Earth's Processes as Hazards, Disasters, and Catastrophes. 3rd ed.
MLA-referens (8:e uppl.)Keller, Edward A., et al. Natural Hazards: Earth's Processes as Hazards, Disasters, and Catastrophes. 3rd ed.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.