APA Style
National geographic : titanic. (2012).
Indonesia:
National Geographic Society.
Chicago Style
National geographic : titanic.
april 2012.
Indonesia:
National Geographic Society,
2012.
Text.
MLA Style
National geographic : titanic.
april 2012.
Indonesia:
National Geographic Society,
2012.
Text.
Turabian Style
National geographic : titanic.
Indonesia:
National Geographic Society,
2012.
Print.