Garraty , J. A., & Gay, P. (1981). The Columbia history of the world. Dorset Press.
Lua i Stíl Chicago (17ú heag.)Garraty , John A., agus Peter Gay. The Columbia History of the World. New York: Dorset Press, 1981.
Lua MLA (9ú heag.)Garraty , John A., agus Peter Gay. The Columbia History of the World. Dorset Press, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.