Selltiz, Claire <br/><br/>
Research methods in social relations   

 - 3rd. ed. 
 - New York    1976 
 - xv, 624 p. 
 -   .
<br/><br/><label>ISBN: </label>003080986x 
<br/><br/><label>Dewey Class. No.: </label>370.78  / S468