Dyfyniad APA

Plummer, C. C., Carlson, D. H., & McGeary, D. (2005). Physical geology (10th ed.). Boston: McGraw-Hill.

Dyfyniad Arddull Chicago

Plummer, Charles C., Diane H. Carlson, và David McGeary. Physical Geology. 10th ed. Boston: McGraw-Hill, 2005.

Dyfyniad MLA

Plummer, Charles C., Diane H. Carlson, và David McGeary. Physical Geology. 10th ed. Boston: McGraw-Hill, 2005.

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