Cita APA (7th ed.)
Garraty, J. A., & Gay, P. (1972). The Columbia history of the world. ([1st ed.].). Harper & Row.
Cita Chicago (17th ed.)
Garraty, John Arthur, i Peter Gay. The Columbia History of the World. [1st ed.]. New York: Harper & Row, 1972.
Cita MLA (9th ed.)
Garraty, John Arthur, i Peter Gay. The Columbia History of the World. [1st ed.]. Harper & Row, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.