APA (7th ed.) Citation

De Blij, H. J., & Müller, P. O. (1991). Geography, regions and concepts (6th ed.). J. Wiley.

Chicago Style (17th ed.) Citation

De Blij, Harm J., and Peter O. Müller. Geography, Regions and Concepts. 6th ed. New York ; Chichester: J. Wiley, 1991.

MLA (9th ed.) Citation

De Blij, Harm J., and Peter O. Müller. Geography, Regions and Concepts. 6th ed. J. Wiley, 1991.