Gaya APA
de BONO, Edward. (1985).
Six thinking hats .
Middlesex:
Penguin Books.
Gaya Chicago
de BONO, Edward.
Six thinking hats.
Middlesex:
Penguin Books,
1985.
Text.
Gaya MLA
de BONO, Edward.
Six thinking hats.
Middlesex:
Penguin Books,
1985.
Text.
Gaya Turabian
de BONO, Edward.
Six thinking hats.
Middlesex:
Penguin Books,
1985.
Print.