(1928). Whither mankind: A panorama of modern civilization. New York: Longmans, Green and Co.
Dyfyniad Arddull ChicagoWhither Mankind: A Panorama of Modern Civilization. New York: Longmans, Green and Co, 1928.
Dyfyniad MLAWhither Mankind: A Panorama of Modern Civilization. New York: Longmans, Green and Co, 1928.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.