Author: Ward, A C
Publisher:Methuen, London
Copyright:1936
Author: Salvemini, Gaetano
Publisher:Victor Gollancz, London
Copyright:1936
Author: Firth, Raymond
Publisher:George Allen & Unwin Ltd., London
Copyright:1936
Author: Bhattacharya,Vivek Ranjan
Publisher:Metropolitan,New Delhi
Copyright:1989