Dyfyniad APA
De Blij, H. J., & Muller, P. O. (1997). Geography: Realms, regions, and concepts (8th ed.). J. Wiley.
Dyfyniad Arddull Chicago
De Blij, Harm J., and Peter O. Muller. Geography: Realms, Regions, and Concepts. 8th ed. New York: J. Wiley, 1997.
Dyfyniad MLA
De Blij, Harm J., and Peter O. Muller. Geography: Realms, Regions, and Concepts. 8th ed. J. Wiley, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.