Gaya APA

Youngsun, C. (2020). Why? Dangerous Substance: Material Berbahaya (Cet.1). Jakarta: Elex Media Komputindo.

Gaya MLA

Youngsun, Cho. "Why? Dangerous Substance: Material Berbahaya". Cet.1 Jakarta: Elex Media Komputindo, 2020. Text.