Cita APA (7th ed.)
Burns, E. M., & Ralph, P. L. (1958). World civilizations: From ancient to contemporary (Segunda edición.). W. W. Norton.
Cita Chicago (17th ed.)
Burns, Edward McNall, i Philip Lee Ralph. World Civilizations: From Ancient to Contemporary. Segunda edición. New York: W. W. Norton, 1958.
Cita MLA (9th ed.)
Burns, Edward McNall, i Philip Lee Ralph. World Civilizations: From Ancient to Contemporary. Segunda edición. W. W. Norton, 1958.
Atenció: Aquestes cites poden no estar 100% correctes.