Author: Roy, Bijoy Prasad Singh
Publisher:Thacker, Spink, Calcutta
Copyright:1943
Author: Chaltuahkhuma
Publisher:Chaltuahkhuma, Aizawl
Copyright:1981
Author: Chandrasekharan, Conjeeveram Viswanatha
Publisher:Rochouse and Sons., Madras
Copyright:1943
Author: Visvesvaraya, M.
Publisher:All India Manufactres Organization, Bombay
Copyright:1943
Author: Aggarwala, Om Prakash
Publisher:The University Book Agency, Lahore
Copyright:1943
Author: Aronson, A.
Publisher:Kitabistan, Allahabad
Copyright:1943