Chhatwal, G.R. <br/><br/>
Encyclopaedia Of World Great Scientists(Vol.6) 
/ by G.R.Chhatwal 
 - New Delhi:  Anmol Publications Pvt.Ltd.,  1997. 
 - 376p. 
<br/><br/><label>ISBN: </label>8170416507 
<br/><br/><label>Dewey Class. No.: </label>925  / CHH/E