Cita APA (7th ed.)
Smith, G. E. (1929). Human history (First edition.). W.W. Norton & Company.
Cita Chicago (17th ed.)
Smith, Grafton Elliot. Human History. First edition. New York: W.W. Norton & Company, 1929.
Cita MLA (9th ed.)
Smith, Grafton Elliot. Human History. First edition. W.W. Norton & Company, 1929.
Atenció: Aquestes cites poden no estar 100% correctes.