Dyfyniad APA

Plummer, C. C., & Carlson, D. H. (2005). Physical geology (10h ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Plummer, Charles C., and Diane H. Carlson. Physical Geology. 10h ed. New York: McGraw-Hill, 2005.

Dyfyniad MLA

Plummer, Charles C., and Diane H. Carlson. Physical Geology. 10h ed. McGraw-Hill, 2005.

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