Cita APA (7a ed.)

Keylor, W. R. (2006). The twentieth-century world and beyond: An international history since 1900 (5th ed.). Oxford University Press.

Cita Chicago Style (17a ed.)

Keylor, William R. The Twentieth-century World and Beyond: An International History Since 1900. 5th ed. New York [etc.]: Oxford University Press, 2006.

Cita MLA (9a ed.)

Keylor, William R. The Twentieth-century World and Beyond: An International History Since 1900. 5th ed. Oxford University Press, 2006.