Cita APA (7th ed.)

De Blij, H. J. (1971). Geography: Regions & concepts. Wiley.

Cita Chicago (17th ed.)

De Blij, Harm J. Geography: Regions & Concepts. New York: Wiley, 1971.

Cita MLA (9th ed.)

De Blij, Harm J. Geography: Regions & Concepts. Wiley, 1971.