Dyfyniad APA

De Blij, H. J., & Muller, P. O. (2010). Geography: Realms, regions, and concepts (14th ed.). Wiley.

Dyfyniad Arddull Chicago

De Blij, Harm J., and Peter O. Muller. Geography: Realms, Regions, and Concepts. 14th ed. Hoboken, N.J: Wiley, 2010.

Dyfyniad MLA

De Blij, Harm J., and Peter O. Muller. Geography: Realms, Regions, and Concepts. 14th ed. Wiley, 2010.

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