APA (7th ed.) Zitazioa
Smith, G. E. (1929). Human history (First edition.). W.W. Norton & Company.
Chicago Style (17th ed.) Zitazioa
Smith, Grafton Elliot. Human History. First edition. New York: W.W. Norton & Company, 1929.
MLA (9th ed.) Zitazioa
Smith, Grafton Elliot. Human History. First edition. W.W. Norton & Company, 1929.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.