Keylor, W. R. (2006). The twentieth century world and beyond: An international history since 1900 (Ed.5.). Oxford.
Dyfyniad Arddull ChicagoKeylor, William R. The Twentieth Century World and Beyond: An International History Since 1900. Ed.5. New York: Oxford, 2006.
Dyfyniad MLAKeylor, William R. The Twentieth Century World and Beyond: An International History Since 1900. Ed.5. Oxford, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.