Williams, K R <br/><br/>
Natural calculator : using the natural processes of the mind for mental calculation 

 - Delhi  Motilal Banarsidass  1991 
 - xxii, 85p. ;  
<br/><br/> Includes bibliographical references. 
<br/><br/><label>ISBN: </label>8120819624 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics -- Vedic mathematics <br/>Mental calculations