Cita APA (7th ed.)
De Blij, H. J., & Muller, P. O. (2006). Geography: Realms, regions, and concepts (12th ed.). John Wiley & Sons.
Cita Chicago (17th ed.)
De Blij, Harm J., i Peter O. Muller. Geography: Realms, Regions, and Concepts. 12th ed. Hoboken, NJ: John Wiley & Sons, 2006.
Cita MLA (9th ed.)
De Blij, Harm J., i Peter O. Muller. Geography: Realms, Regions, and Concepts. 12th ed. John Wiley & Sons, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.