Cita APA (7a ed.)

Spykman, N. J. (1944). The geography of the peace. Harcourt, Brace and Co..

Cita Chicago Style (17a ed.)

Spykman, Nicholas John. The Geography of the Peace. New York: Harcourt, Brace and Co., 1944.

Cita MLA (9a ed.)

Spykman, Nicholas John. The Geography of the Peace. Harcourt, Brace and Co., 1944.