Dyfyniad APA

Montgomery, C. W. (2006). Environmental geology (7th ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Montgomery, Carla W. Environmental Geology. 7th ed. Boston: McGraw-Hill, 2006.

Dyfyniad MLA

Montgomery, Carla W. Environmental Geology. 7th ed. McGraw-Hill, 2006.

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