Darmadi, Darmadi, Thomas SY Choong, Chuah T.G, Robiah Yunus, and Y.H Taufiq Yap. 2008. “Adsorption of Methylene Blue from Aqueous Solutions on Carbon Coated Monolith”. ASEAN Journal of Chemical Engineering 8 (1), 26-37. https://journal.ugm.ac.id/v3/AJChE/article/view/7696.