Cita APA (7a ed.)
Smith, G. E. (1929). Human history (First edition.). W.W. Norton & Company.
Cita Chicago Style (17a ed.)
Smith, Grafton Elliot. Human History. First edition. New York: W.W. Norton & Company, 1929.
Cita MLA (9a ed.)
Smith, Grafton Elliot. Human History. First edition. W.W. Norton & Company, 1929.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.