Gaya APA

Grimnamu, ., Novianti, E, N. (2014). Why? People : Stephen Hawking . Jakarta: Elex Media Komputindo.

Gaya MLA

Grimnamu, ., Novianti, Endah, Nawang. "Why? People : Stephen Hawking". Jakarta: Elex Media Komputindo, 2014. Text.