Dyfyniad APA

De Blij, H., & Muller, P. O. (2004). Geography: Realms, regions and concepts (11th ed.). John Wiley.

Dyfyniad Arddull Chicago

De Blij, H.J, and Peter O. Muller. Geography: Realms, Regions and Concepts. 11th ed. New Jersey: John Wiley, 2004.

Dyfyniad MLA

De Blij, H.J, and Peter O. Muller. Geography: Realms, Regions and Concepts. 11th ed. John Wiley, 2004.

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