Othaman, R., A. Susilo, H. Habaki, and R. Egashira. “Treatment of Wastewater Containing Wood Waste Pyroligneous Acid Preservative by Activated Carbon in Rubberwood Manufacturing Process”. ASEAN Journal of Chemical Engineering, Vol. 9, no. 2, Dec. 2009, pp. 1-7, https://dev.journal.ugm.ac.id/v3/AJChE/article/view/8042.