Six thinking hats.
Bono, Edward De.
Six thinking hats. - Australia : Penguin books, 1999. - xiii, 177 p. 18 cm.
9780141037554
Psychology.
153.42 BON
Six thinking hats. - Australia : Penguin books, 1999. - xiii, 177 p. 18 cm.
9780141037554
Psychology.
153.42 BON