De Bono, Edward,  1933- <br/><br/>
PO :  beyond yes & no / 
Edward de Bono. 
 - London :  Penguin Books,  1973, [Reprinted 1990] 
 - 176 p. :  ill. ;  18 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Thought and thinking.<br/>Creative thinking.
<br/><br/><label>Dewey Class. No.: </label>153.42  / BOP 1990