Citazione APA

William R Keylor. (2001). The twentieth-century world: An international history (4th.). Oxford University Press.

Stile di citazione Chicago

William R Keylor. The Twentieth-century World: An International History. 4th. New York: Oxford University Press, 2001.

Citazione MLA

William R Keylor. The Twentieth-century World: An International History. 4th. Oxford University Press, 2001.