Tolong jelaskan mengenai Human History (1930) dari Grafton Elliot Smith

The Diffusion of Culture (London, Watts 1933)

A. P. Elkin/N. W. G. Macintosh, Grafton Elliot Smith, The Man and his Work (Sydney University Press 1974)

W. R. Dawson, Sir Grafton Elliot Smith: a Biographical Record by his Colleagues (London, Cape 1938)