De Bono, Edward <br/><br/>
PO beyond yes and no / 
by Edward De Bono. 
 - London:  Penguin books,  1972. 
 - 175p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Creative thinking<br/>Resoning
<br/><br/><label>Dewey Class. No.: </label>160  / DEB