Create your web home (Punjabi) 

 - 1st (ed.) 
 - New Delhi:   National Institute of Science Communication and Information Resources,   2002 
 - 70p. 
<br/><br/><label>ISBN: </label>81-7236-239-0 
<br/><br/><label>Universal Decimal Class. No.: </label>D 681.324  / P2