Tekriwal,  Gaurav <br/><br/>
Maths Sutras from Around the World: Speed Calculations on Your Fingertips 

 - 1st 
 - UK  Penguin  2017 
 - 177 
<br/><br/><label>ISBN: </label> 199 
<br/><br/><label>Dewey Class. No.: </label>510 TEK