Cita APA (7a ed.)

Kant, I., & Butler, N. M. (1939). Perpetual peace. Columbia University Press.

Cita Chicago Style (17a ed.)

Kant, Immanuel, y Nicholas Murray Butler. Perpetual Peace. New York: Columbia University Press, 1939.

Cita MLA (9a ed.)

Kant, Immanuel, y Nicholas Murray Butler. Perpetual Peace. Columbia University Press, 1939.