Al Ries  <br/><br/>
Positioning:  the battle for your mind 
Al Ries  
 - 1st. 
 - New York, N.W.  McGraw-Hill  2000 
<br/><br/><label>ISBN: </label>9780071359160 
<br/><br/><label>Dewey Class. No.: </label>659.1  / 4332