APA (7th ed.) Citation

Ralph, P. L. (1997). World civilizations: Their history and their culture (Ninth Edition.). W.W. Norton and Company.

Chicago Style (17th ed.) Citation

Ralph, Philip Lee. World Civilizations: Their History and Their Culture. Ninth Edition. New York: W.W. Norton and Company, 1997.

MLA (9th ed.) Citation

Ralph, Philip Lee. World Civilizations: Their History and Their Culture. Ninth Edition. W.W. Norton and Company, 1997.