Competitive strategy : techniques for analyzing industries and competitors 
Porter, Michael E. 
 -  The Free Press.  1980 
 - xx, 396 pages. 
<br/><br/>
<br/><br/><label>ISBN: </label>0-02-925360-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Competition.
<br/><br/><label>Dewey Class. No.: </label>658 P67c 1980