Edward  De Bono  Six  Thinking Hats  Edward  De Bono  Six  Thinking Hats  Textual Documents 

 - 1999. 
 - [s.l]:  penguin Books. 
 - 177:  paper. 
<br/><br/><label>ISBN: </label>  
<br/><br/><label>Dewey Class. No.: </label>153.42  / BON