Kotler, Philip. <br/><br/>
Principles of marketing / 
Philip Kotler and Gary Armstrong. 
 - 6th edition. 
 - New Jersey :  Prentice Hall, Englewood Cliffs,  1994. 
 - 692 pages :  illustrations ;  28 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0130980390