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

 -  Penguin Books  1999 
 - xiii, 
<br/><br/><label>ISBN: </label>0-14-029666-2  497.80 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PSYCHOLOGY
<br/><br/><label>Dewey Class. No.: </label>158  / DE