APA (7th ed.) Citation

Schulzinger. (1984). American diplomacy in the twentieth century. Oxford University Press.

Chicago Style (17th ed.) Citation

Schulzinger. American Diplomacy in the Twentieth Century. New York: Oxford University Press, 1984.

MLA (8th ed.) Citation

Schulzinger. American Diplomacy in the Twentieth Century. Oxford University Press, 1984.