kothari, C. R. <br/><br/>
Research Methodology : Methods and Techniques 

 - 4th ed. 
 - New Delhi  New Age  2020 
 - xxi,458p. 
<br/><br/><label>ISBN: </label>9789386649225 
<br/><br/><label>Dewey Class. No.: </label>001.42  / KOT