Methodology in social research 
<label>;</label> Blalock, Ann B. <label>;</label> Blalock, Hubert M. 
 - New York  McGraw Hill  1968 
 - 493p.  ill  24 cm. 
<br/><br/>SR 
<br/><br/><label>Dewey Class. No.: </label>301  / B