Chhatwal, G.R. <br/><br/>
Encyclopaedia of World Great Scientists ( Volume 4 ) 
/ edited by G.R. Chhatwal ( et.al ) 
 - New Delhi:  Anmol Publications Pvt. Ltd.,  1997. 
 - 760p. 
<br/><br/><label>ISBN: </label>8170416507 
<br/><br/><label>Dewey Class. No.: </label>925  / CHH/E