Burns, E. M., & Ralph, P. L. (1974). World civilizations: Their history and their culture. W.W. Norton & Company.
Chicago-čujuhus (17. p.)Burns, Edward McNall, juo Philip Lee Ralph. World Civilizations: Their History and Their Culture. New York: W.W. Norton & Company, 1974.
MLA-čujuhus (9. p.)Burns, Edward McNall, juo Philip Lee Ralph. World Civilizations: Their History and Their Culture. W.W. Norton & Company, 1974.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.