Gaya APA
Heo, Soon-Bong. (2002).
Why? Lingkungan .
Korea:
PT Elex Media Komputindo.
Gaya Chicago
Heo, Soon-Bong.
Why? Lingkungan.
Korea:
PT Elex Media Komputindo,
2002.
Text.
Gaya MLA
Heo, Soon-Bong.
Why? Lingkungan.
Korea:
PT Elex Media Komputindo,
2002.
Text.
Gaya Turabian
Heo, Soon-Bong.
Why? Lingkungan.
Korea:
PT Elex Media Komputindo,
2002.
Print.