Author: Srinivasan, N.
Publisher:The World Press, Calcutta
Copyright:1954
Author: Sastri, K. A. Nilakanta
Publisher:Orient Longmans, Bombay
Copyright:1963
Author: Gunnis, Rupert
Publisher:Harvard University Press, Massachusetts
Copyright:1954
Author: Swami Chinmayananda
Publisher:Chinmaya Publication Trust, Madras
Copyright:1963
Author: Keer, Dhananjay
Publisher:Popular Prakashan,Bombay
Copyright:1954
Author: Jayatilleke, K. N.
Publisher:George allen and unwin, London
Copyright:1963
Author: Parkinson, C. Northcote
Publisher:John Murray, Albemarle Street, London
Copyright:1963
Author: Mehta, Vaikunth Lalubhai
Publisher:Sam. M. Neksatkhan, Bombay
Copyright:1944