Cita APA (7th ed.)

Schulzinger, R. D. (1994). American diplomacy in the twentieth century (3a. ed.). Oxford University Press.

Cita Chicago (17th ed.)

Schulzinger, Robert D. American Diplomacy in the Twentieth Century. 3a. ed. Nueva York: Oxford University Press, 1994.

Cita MLA (9th ed.)

Schulzinger, Robert D. American Diplomacy in the Twentieth Century. 3a. ed. Oxford University Press, 1994.