Marketing : an introduction 
Kotler, Philip. 
 - second edition. 
 -  Prentice-Hall, Inc.  1990 
 - xxiv, 592 pages. 
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<br/><br/><label>ISBN: </label>0-13-558883-9 
<br/><br/><label>Dewey Class. No.: </label>658.8 K84m 1990