APA Style
CHO, Y., LEE, Y. (2020).
Why? : Dangerous Substance = Material Berbahaya .
Jakarta:
PT Elex Media Komputindo.
MLA Style
CHO, Youngsun., LEE, Youngho.
"Why? : Dangerous Substance = Material Berbahaya".
Jakarta:
PT Elex Media Komputindo,
2020.
Text.