Tekriwal , Gaurav <br/><br/>
Speed calculation :  Gaurav Tekriwal 
ganit mein assem safalta paye / 
 - 1st ed.  
 - New Delhi :   Prabhat publication ,  2017. 
 - 272 p.  
<br/><br/><label>ISBN: </label>9789352661503  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental calculators
<br/><br/><label>Dewey Class. No.: </label>513.9  / TEK/S