Gupta  , S.P. <br/><br/>
Sankhayki ke Sindhant 

 - New Delhi  Sultan Chand & Sons  2007 
 - 
<br/><br/><label>ISBN: </label>81-8054-523-7 
<br/><br/><label>Dewey Class. No.: </label>519.5H   Gup.P7