Ries A L <br/><br/>
Positioning: battle for your mind 
Ries A L; Trout J 
 - 1 rev 
 - New York  New York, McGraw-Hill  1986 
 - 213p 
<br/><br/><label>ISBN: </label>0-07-100273-1 
<br/><br/><label>Source: </label>Textbook