APA (7th ed.) Citation

Ferrell, R. H. (1988). American diplomacy: The twentieth century (4th ed.). Norton.

Chicago Style (17th ed.) Citation

Ferrell, Robert H. American Diplomacy: The Twentieth Century. 4th ed. New York, N.Y.: Norton, 1988.

MLA (9th ed.) Citation

Ferrell, Robert H. American Diplomacy: The Twentieth Century. 4th ed. Norton, 1988.