APA Style
GRAHAM, Billy. (1998).
The secret of happiness=rahasia kebahagiaan .
Batam:
Interaksara.
Chicago Style
GRAHAM, Billy.
The secret of happiness=rahasia kebahagiaan.
Batam:
Interaksara,
1998.
Text.
MLA Style
GRAHAM, Billy.
The secret of happiness=rahasia kebahagiaan.
Batam:
Interaksara,
1998.
Text.
Turabian Style
GRAHAM, Billy.
The secret of happiness=rahasia kebahagiaan.
Batam:
Interaksara,
1998.
Print.