Dyfyniad APA

Keller, E. A., & Blodgett, R. H. (2008). Natural hazards: Earth's processes as hazards, disasters, and catastrophes (2nd ed.). Pearson/Prentice Hall.

Dyfyniad Arddull Chicago

Keller, Edward A., and Robert H. Blodgett. Natural Hazards: Earth's Processes as Hazards, Disasters, and Catastrophes. 2nd ed. Upper Saddle River, NJ: Pearson/Prentice Hall, 2008.

Dyfyniad MLA

Keller, Edward A., and Robert H. Blodgett. Natural Hazards: Earth's Processes as Hazards, Disasters, and Catastrophes. 2nd ed. Pearson/Prentice Hall, 2008.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.