Burgess Robert G Ed. <br/><br/>
Key variables in social investigation . 

 - London  Routledge and Kegan Paul         1986 
 - xi,276p  cm. 
<br/><br/> Bibliography chapterwise 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Yb4, M6