Kothari, C R <br/><br/>
Research methodology :  Methods and tehniques 
C R Kothari and Gaurav Garg 
 - 3ed. 
 - New Delhi :  New Age international (P) Limited Publishers,  2014. 
<br/><br/><label>ISBN: </label>9788122436235 
<br/><br/><label>Dewey Class. No.: </label>300.723  / KOT.R;6