Gaya APA
De Bono, Edward. ().
Future positive .
London:
Penguin Random House.
Gaya Chicago
De Bono, Edward.
Future positive.
London:
Penguin Random House,
.
Text.
Gaya MLA
De Bono, Edward.
Future positive.
London:
Penguin Random House,
.
Text.
Gaya Turabian
De Bono, Edward.
Future positive.
London:
Penguin Random House,
.
Print.