Porter Micheal E <br/><br/>
Competitive advantage:Creating and sustaining superior performance 
Porter Micheal E 
 - N.Y  N.Y, Macmillan  1985 
 - xviii,555 
<br/><br/><label>ISBN: </label>0-02-925090-0 
<br/><br/><label>Source: </label>Textbook