Cita APA (7th ed.)

DE BLIJ, H. J., & MULLER, P. O. (1988). Geography: Regions and concepts.-- ed.5. John Wiley and Sons.

Cita Chicago (17th ed.)

DE BLIJ, Harm J., i Peter O. MULLER. Geography: Regions and Concepts.-- Ed.5. New York: John Wiley and Sons, 1988.

Cita MLA (9th ed.)

DE BLIJ, Harm J., i Peter O. MULLER. Geography: Regions and Concepts.-- Ed.5. John Wiley and Sons, 1988.