Maarof, H. I., B. H. Hameed, and A. L. Ahmad. “Adsorption Isotherms for Phenol Onto Activated Carbon”. ASEAN Journal of Chemical Engineering, Vol. 4, no. 1, Dec. 2004, pp. 70-76, https://journal.ugm.ac.id/v3/AJChE/article/view/7591.