APA引文

VALKENBURG, S. v. (1960). Elements of political geography.-- ed.2. Prentice-Hall.

Chicago Style (17th ed.) Citation

VALKENBURG, Samuel van. Elements of Political Geography.-- Ed.2. New Jersey: Prentice-Hall, 1960.

MLA引文

VALKENBURG, Samuel van. Elements of Political Geography.-- Ed.2. Prentice-Hall, 1960.