De Bono, Edward,  1933- <br/><br/>
Six thinking hats / 
Edward De Bono. 
 - London :  Penguin Books,  1990. 
 - 207 p. ;  20 cm. 
<br/><br/><label>ISBN: </label>014013784X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Thought and thinking.<br/>Creative thinking.