Author: Montagu, Edwin Samuel
Publisher:William Heinemann Ltd., London
Copyright:1930
Author: Chatterjee, S.
Publisher:The Technical Journals of India, Calcutta
Copyright:1962
Author: Vivekananda
Publisher:Julian Press, New York
Copyright:1962
Author: গোস্বামী, শ্রীজীব Goswami, Sreejib
Publisher:Calcutta University
Copyright:1962