Tripathy,P. C. <br/><br/>
Textbook of research methodology in social sciences 

 - 6 
 - New Delhi  Sultan Chand & Sons  1987 
<br/><br/><label>ISBN: </label>978-81-8054-686-0 
<br/><br/><label>Dewey Class. No.: </label>330.72  / TRI/TEX