By Galton, Ray, Simpson, Alan
By Neuman, Shirley
By Seddon, David
By Ayer, A. J.
By Martinez-Alier, Juan
By Wharton, Clifton R.
By Hill, Octavia
By Magnus J. Sampson
By John MacKenzie
By Edward Long
By William Hale (School of Oriental and African Studies, London, UK)
By Geoffrey G. Jones