APA (7th ed.) Citation

Keylor, W. R. (2011). The Twentieth-century world and beyond: An international history since 1900 (6th ed.). Oxford University Press.

Chicago Style (17th ed.) Citation

Keylor, William R. The Twentieth-century World and Beyond: An International History Since 1900. 6th ed. New York: Oxford University Press, 2011.

MLA (9th ed.) Citation

Keylor, William R. The Twentieth-century World and Beyond: An International History Since 1900. 6th ed. Oxford University Press, 2011.