APA (7th ed.) Citation

De Blij, H. J. (1967). Systematic political geography. Wiley.

Chicago Style (17th ed.) Citation

De Blij, Harm J. Systematic Political Geography. New York u.a: Wiley, 1967.

MLA (9th ed.) Citation

De Blij, Harm J. Systematic Political Geography. Wiley, 1967.