Dyfyniad APA

Gates, A. E. (2007). Encyclopedia of earthquakes and volcanoes (3rd ed.). Facts on File.

Dyfyniad Arddull Chicago

Gates, Alexander E. Encyclopedia of Earthquakes and Volcanoes. 3rd ed. New York: Facts on File, 2007.

Dyfyniad MLA

Gates, Alexander E. Encyclopedia of Earthquakes and Volcanoes. 3rd ed. Facts on File, 2007.

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