00549pamaa2200181 4500 0000053621 20151001090000.0 151001s2000 9780141033051 (pbk.) BF441 DEB 2000 DE BONO, Edward Six thinking hats Edward de Bono. 1st Back Bay pbk. ed. / rev. and updated. London: Penguin Books, 2000. xiii, 177 p.: ill; 21 cm. Library Thought and thinking http://www.penguin.com