Covey, Stephen R. <br/><br/>
Principle-centered leadership / 
Stephen R. Covey. 
 - New York :  Free Press,  1991. 
 - 335 p. 
<br/><br/><label>ISBN: </label>0671792806 :  KES 2,380 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Success--Psychological aspects.