Gaya APA

Sor, E., Zajac, M. (2024). Happy Learning Math : Olive and Oscar the Orangutans Swing on the Trees (Malgosia Zajac). Jakarta: Gramedia Pustaka Utama.

Gaya MLA

Sor, Eynn., Zajac, Malgosia. "Happy Learning Math : Olive and Oscar the Orangutans Swing on the Trees". Malgosia Zajac Jakarta: Gramedia Pustaka Utama, 2024. Text.