Blalock, Ann B, ed Blalock, Hubert M, ed <br/><br/>
Methodology in social research 

 - London  McGraw - hill  1971 
 - 493p.; 21cm. 
 - McGraw - hill series in sociology .
<br/><br/><label>ISBN: </label>70941815 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Experimental designs<br/>Social research<br/>Social stratification<br/>Sociology - research