APA Style
National Geographic, National Geographic. (2017).
National Geographic; Januari 2017 .
Jakarta:
National Geographic.
Chicago Style
National Geographic, National Geographic.
National Geographic; Januari 2017.
Jakarta:
National Geographic,
2017.
.
MLA Style
National Geographic, National Geographic.
National Geographic; Januari 2017.
Jakarta:
National Geographic,
2017.
.
Turabian Style
National Geographic, National Geographic.
National Geographic; Januari 2017.
Jakarta:
National Geographic,
2017.
.