APA (7th ed.) Citation

De Blij & Muller. (1992). Geography, regions and concepts (Rev. 6th ed.).

Chicago Style (17th ed.) Citation

De Blij and Muller. Geography, Regions and Concepts. Rev. 6th ed. New York John Wiley & Sons, Inc, 1992.

MLA (9th ed.) Citation

De Blij and Muller. Geography, Regions and Concepts. Rev. 6th ed. 1992.