Lehmann Donald R <br/><br/>
Market reseach and analysis. 
Lehmann Donald R 
 - 3rd. 
 - U.S.A.  U.S.A., IRWIN  1989 
 - 895p 
<br/><br/><label>ISBN: </label>0-256-07038-5 
<br/><br/><label>Source: </label>Textbook