Research methods in social relations / 
Claire Selltiz ... et al. 
 - Rinehart and Winston, New York :  Holt,  1959. 
 - 622 pages ;  22 cm. 
<br/><br/>Bibliography : page 589-622. 
<br/><br/><label>ISBN: </label>0030068002 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Research.