By Bono, Edward De <br/><br/>
Six thinking hats 

 - 1st 
 - Great Britain  Penguin Books  1999 
 - xiii; 177p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Management philosphy
<br/><br/><label>Dewey Class. No.: </label>153.35  / BON