Gaya APA
De Bono, Edward. (1979).
Future positive .
London:
Vermilion.
Gaya Chicago
De Bono, Edward.
Future positive.
London:
Vermilion,
1979.
Text.
Gaya MLA
De Bono, Edward.
Future positive.
London:
Vermilion,
1979.
Text.
Gaya Turabian
De Bono, Edward.
Future positive.
London:
Vermilion,
1979.
Print.