APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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