Dyfyniad APA

Montgomery, C. W. (2003). Environmental geology (6th ed.). New York: McGraw-Hill.

Dyfyniad Arddull Chicago

Montgomery, Carla W. Environmental Geology. 6th ed. New York: McGraw-Hill, 2003.

Dyfyniad MLA

Montgomery, Carla W. Environmental Geology. 6th ed. New York: McGraw-Hill, 2003.

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