Gaya APA
Wook, P, S, -., Christin, I.
(2009).
Why? : Happy Math 2
.
Jakarta:
Elexmedia Komputindo.
Gaya MLA
Wook, Park, Sang, -., Christin, Irene.
"Why? : Happy Math 2".
Jakarta:
Elexmedia Komputindo,
2009.
Book.