Kotler, Philips. <br/><br/>
Principles of marketing / 
by Philip Kotler,Gary Amstrong. 
 - 14th ed. 
 - England :  Pearson educational limited,  2013. 
 - p. :iv, 136 P :  ill ;   cm. 
<br/><br/><label>ISBN: </label>9780273779827 
<br/><br/><label>LC Class. No.: </label>HF5415  / .K68