Dhawan ,K S <br/><br/>
Readings in library science Vol. 3(Principles of information retrieval) 
by Dhawan ,K S 
 - New Delhi  Commonwealth pub.  2001 
<br/><br/><label>ISBN: </label>8171696457 
<br/><br/><label>Dewey Class. No.: </label>028 DHA/REA.4