APA Style
National Geographic, National Geographic. (2018).
National Geographic; Mei 2018 .
Jakarta:
National Geographic.
Chicago Style
National Geographic, National Geographic.
National Geographic; Mei 2018.
Jakarta:
National Geographic,
2018.
.
MLA Style
National Geographic, National Geographic.
National Geographic; Mei 2018.
Jakarta:
National Geographic,
2018.
.
Turabian Style
National Geographic, National Geographic.
National Geographic; Mei 2018.
Jakarta:
National Geographic,
2018.
.