APA (7th ed.) Citation

De Blij, H. J., & Muller, P. O. (1992). Geography regions and concepts (Sixth edition, revised.). Wiley.

Chicago Style (17th ed.) Citation

De Blij, Harm J., and Peter O. Muller. Geography Regions and Concepts. Sixth edition, revised. New York: Wiley, 1992.

MLA (9th ed.) Citation

De Blij, Harm J., and Peter O. Muller. Geography Regions and Concepts. Sixth edition, revised. Wiley, 1992.