Covey, Stephen R. <br/><br/>
Principle-centered leadership / 
Stephen R. Covey. 
 - New York :  Summit Books,  1990. 
 - 334 p. ;  23 cm. 
<br/><br/><label>ISBN: </label>0671749102 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Success--Psychological aspects.<br/>Success in business.<br/>Leadership.