APA Style

Covey, S., Murtihardjana, L. (2015). Goob dan Kakeknya = Goob and His Grandpa . Jakarta: Libri.

MLA Style

Covey, Sean., Murtihardjana, Lanny. "Goob dan Kakeknya = Goob and His Grandpa". Jakarta: Libri, 2015. Text.