Semenik R J <br/><br/>
Principles of marketing : Global perspective 
Semenik R J; Bamossy G J 
 - USA  USA, South Western Pub.  1993 
 - 649p 
<br/><br/><label>ISBN: </label>0-538-81714-3 
<br/><br/><label>Source: </label>Textbook