Usha Puri <br/><br/>
Distance education 

 - New Delhi  Pragun Publications  2006 
 - x, 341p. 
<br/><br/><label>ISBN: </label> RS 725.00 
<br/><br/><label>Source: </label> RS 725.00 
<br/><br/><label>Dewey Class. No.: </label>378.03 USH