Puri B. R. S. L. R. a. S. P. M., .Physical chemistry. : Shoban Lal Nagin Chand &Co.
Puri B R Sharma L R and S Pathania Madan, .Physical chemistry. : Shoban Lal Nagin Chand &Co.
Puri B R Sharma L R and S Pathania Madan, .: Shoban Lal Nagin Chand &Co. .