Research methods in social relations  
/ Claire Selltz, Marie Jadoha 
. - New York  : Holt, Rinchart and Winston, 1965
. - XVI-622 p.  ; 24 cm. 
<br/><br/>Bibliogr., index 
<br/><br/><label>Source: </label> Don 
<br/><br/><label>Universal Decimal Class. No.: </label>159.9 072.5