Cita APA (7a ed.)

Spykman, N. J. (1942). America´s strategy in world politics. Harcourt.

Cita Chicago Style (17a ed.)

Spykman, Nicholas J. America´s Strategy in World Politics. New York: Harcourt, 1942.

Cita MLA (9a ed.)

Spykman, Nicholas J. America´s Strategy in World Politics. Harcourt, 1942.