Dyfyniad APA

De Blij, H. J., & Muller, P. O. (1993). Physical geography of the global environment. Wiley.

Dyfyniad Arddull Chicago

De Blij, Harm J., and Peter O. Muller. Physical Geography of the Global Environment. New York: Wiley, 1993.

Dyfyniad MLA

De Blij, Harm J., and Peter O. Muller. Physical Geography of the Global Environment. Wiley, 1993.

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