Churchill G A <br/><br/>
Marketing Research  : Methodological foundations 
Churchill G A 
 - 4th 
 - CHICAGO  CHICAGO, ChicagoDryden Press  1979 
 - 896p 
<br/><br/><label>ISBN: </label>0-03-022012-2 
<br/><br/><label>Source: </label>Textbook