Selltiz, Claire  <br/><br/>
Research methods in social relations/ 
Claire Selltiz, Lawrence S. Wrightsman, and Stuart W. Cook  
 - Thrid edition  
 - New York;  Holt, Rinehart, and Winston,   1976 
 - xiv, 624pages:  
<br/><br/><label>LC Class. No.: </label>GS H 62   / R45 1976