Gaya APA
Johns,Chris. (2004).
National Geographic .
Washington DC:
National Geographic.
Gaya Chicago
Johns,Chris.
National Geographic.
Washington DC:
National Geographic,
2004.
Terbitan Berseri.
Gaya MLA
Johns,Chris.
National Geographic.
Washington DC:
National Geographic,
2004.
Terbitan Berseri.
Gaya Turabian
Johns,Chris.
National Geographic.
Washington DC:
National Geographic,
2004.
Terbitan Berseri.