De Bono, Edward. <br/><br/>
Po : beyond yes and no  [Books]. 
Edward de Bono. 
 - London  Penguin Books.  1972 
 - 175p. 
<br/><br/><label>ISBN: </label>0140217150  0.00 
<br/><br/><label>Subjects--Personal Names: </label><br/>Creative thinking.
<br/><br/><label>Dewey Class. No.: </label>BF/408  / DEB