Gaya APA

PARK, S., Christin, I. (2009). Why? Happy math 2 (Cet. 1). Jakarta: Elex Media Komputindo.

Gaya MLA

PARK, Sang-Wook., Christin, Irene. "Why? Happy math 2". Cet. 1 Jakarta: Elex Media Komputindo, 2009. Text.