Bozman, Ernest Franklin, editor. Everyman’s Encyclopaedia. 4th Edition, J. M. Dent, 1958, 12 vols. 9: 697
Matthew, Henry Colin Gray et al., editors. Oxford Dictionary of National Biography. http://www.oxforddnb.com/.
Schlessinger, Bernard S., and June H. Schlessinger. The Who’s Who of Nobel Prize Winners, 1901-1995. 3rd ed., Oryx Press, 1996.