Cita APA (7a ed.)

Van Valkenburg, S., & Stotz, C. L. (1954). Elements of political geography (2nd ed.). Prentice-Hall.

Cita Chicago Style (17a ed.)

Van Valkenburg, Samuel, y Carl Louis Stotz. Elements of Political Geography. 2nd ed. New York: Prentice-Hall, 1954.

Cita MLA (9a ed.)

Van Valkenburg, Samuel, y Carl Louis Stotz. Elements of Political Geography. 2nd ed. Prentice-Hall, 1954.