Akaratiwa, S., and Tammanoon Odomman. “Steam Reforming of Methanol Over Cu/Al2O3/ZnO Catalysts”. ASEAN Journal of Chemical Engineering, Vol. 3, no. 1, Dec. 2003, pp. 9-13, https://dev.journal.ugm.ac.id/v3/AJChE/article/view/7572.