De Bono, Edward,  1933-. <br/><br/>
PO :  beyond yes & no / 
Edward de Bono. 
 - London :  Penguin Books,  1990. 
 - 176 pages ;  20 cm. 
<br/><br/><label>ISBN: </label>0140137823 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Thought and thinking--Study and teaching.