De Bono, Edward,  1933- <br/><br/>
Six thinking hats / 
Edward De Bono 
 - revised and updated 
 - New York :  Back Bay Books/Penguin Books,  1999 
 - various pages ;  22 cm. 
<br/><br/><label>ISBN: </label>0316178314 (pbk)  RM60.13 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Thought and thinking