Dyfyniad APA

Carlson, D. H., & Plummer, C. C. (2008). Physical Geology: :Earth revealed (7th ed.). McGraw Hill.

Dyfyniad Arddull Chicago

Carlson, Diane H., and Charles C. Plummer. Physical Geology: :Earth Revealed. 7th ed. Boston: McGraw Hill, 2008.

Dyfyniad MLA

Carlson, Diane H., and Charles C. Plummer. Physical Geology: :Earth Revealed. 7th ed. McGraw Hill, 2008.

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