APA (7th ed.) Citation

Keylor, W. R. (1996). The twentieth-century world: An international history (3rd ed.). Oxford University Press.

Chicago Style (17th ed.) Citation

Keylor, William R. The Twentieth-century World: An International History. 3rd ed. New York: Oxford University Press, 1996.

MLA (9th ed.) Citation

Keylor, William R. The Twentieth-century World: An International History. 3rd ed. Oxford University Press, 1996.