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