Citazione Stile APA (7a Edizione)

Burns, E. M., & Ralph, P. L. (1974). World civilizations: Their history and their culture (5. ed.). Norton.

Citazione stile Chigago Style (17a edizione)

Burns, Edward McNall, e Philip Lee Ralph. World Civilizations: Their History and Their Culture. 5. ed. New York: Norton, 1974.

Citatione MLA (9a ed.)

Burns, Edward McNall, e Philip Lee Ralph. World Civilizations: Their History and Their Culture. 5. ed. Norton, 1974.