Handley, Bill. <br/><br/>
Speed mathematics: secrets of lightning mental calculation 

 - 2nd edition 2006. 
 - New Delhi :  Wrightbooks  2021 
 - 350 pages.  
<br/><br/><label>ISBN: </label>0-7016-3765-X 
<br/><br/><label>Subjects--Topical Terms: </label> Biotechnology 
<br/><br/><label>Dewey Class. No.: </label>513.9  / HAN