De Bono, Edward,  1933- <br/><br/>
Six thinking hats / 
Edward de Bono. 
 - 1st Back Bay pbk. ed., rev. and updated. 
 - London  Penguin Books,  1999. 
 - xiii, 177 p. ;  20 cm. 
<br/><br/> Gratis<br/> 
<br/><br/><label>ISBN: </label>9780140296662 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Thought and thinking.
<br/><br/><label>Dewey Class. No.: </label>153.42 DEB