APA Style

Youngseun, C., Youngho, L. (2017). Why? Social Science - Social Network Service (Cet. 1). Jakarta: Elex Media Komputindo.

MLA Style

Youngseun, Cho., Youngho, Lee. "Why? Social Science - Social Network Service". Cet. 1 Jakarta: Elex Media Komputindo, 2017. Text.