Gaya APA
Schoch, Richard. (2007).
The secret of happiness .
Bandung:
Hikmah.
Gaya Chicago
Schoch, Richard.
The secret of happiness.
Bandung:
Hikmah,
2007.
Text.
Gaya MLA
Schoch, Richard.
The secret of happiness.
Bandung:
Hikmah,
2007.
Text.
Gaya Turabian
Schoch, Richard.
The secret of happiness.
Bandung:
Hikmah,
2007.
Print.