APA (7th ed.) Citation

Ralph, P. L. (1997). World civilizations, their history and their culture (9th ed.). W.W. Norton.

Chicago Style (17th ed.) Citation

Ralph, Philip Lee. World Civilizations, Their History and Their Culture. 9th ed. New York: W.W. Norton, 1997.

MLA (8th ed.) Citation

Ralph, Philip Lee. World Civilizations, Their History and Their Culture. 9th ed. W.W. Norton, 1997.