Gaya APA
Geographic, N. (2019).
National Geographic Kid: Perjuangan Hidup Beruang Kutub (Desember 2019).
Jakarta:
National Geographic Kids.
Gaya MLA
Geographic, National.
"National Geographic Kid: Perjuangan Hidup Beruang Kutub".
Desember 2019
Jakarta:
National Geographic Kids,
2019.
Text.