Dyfyniad APA
Garraty, J. A., & Gay, P. (1972). The Columbia history of the world. ([1st ed.].). Harper & Row.
Dyfyniad Arddull Chicago
Garraty, John Arthur, and Peter Gay. The Columbia History of the World. [1st ed.]. New York: Harper & Row, 1972.
Dyfyniad MLA
Garraty, John Arthur, and Peter Gay. The Columbia History of the World. [1st ed.]. Harper & Row, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.