Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.