APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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