Research methods in social relations / 
by Claire Selltiz and others Published for the Society for the Psychological Study of Social Issues. 
 - 3rd edition. 
 - New York :  Holt,  1976. 
 - 622 pages ;  22 cm. 
<br/><br/><label>ISBN: </label>003080986X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research.