APA Style
de BONO, Edward. (1977).
The Happiness Purpose .
Australia:
Penguin Books.
Chicago Style
de BONO, Edward.
The Happiness Purpose.
Australia:
Penguin Books,
1977.
Text.
MLA Style
de BONO, Edward.
The Happiness Purpose.
Australia:
Penguin Books,
1977.
Text.
Turabian Style
de BONO, Edward.
The Happiness Purpose.
Australia:
Penguin Books,
1977.
Print.