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

 - United States ;   Little Brown and Company,  1992. 
 - xiii, 177 p.  20 cm. 
<br/><br/><label>ISBN: </label>9780241257531 
<br/><br/><label>Dewey Class. No.: </label>153 B72s 1992