Key variables in social investigation / 
edited by Robert G. Burgess. 
 - London :  Routledge & Kegan Paul,  1986. 
 - xi, 276 p. ; 
<br/><br/> 0 
<br/><br/><label>ISBN: </label>0710206216 (pbk.) : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sociology-Research.------
<br/><br/><label>Dewey Class. No.: </label>301.072  / Ke