Srisorrachatr, S., and P. Sriromreun. “Removal of Acid Blue 158 from Solution by Sunflower Seed Hull”. ASEAN Journal of Chemical Engineering, Vol. 13, no. 1, Dec. 2013, pp. 25-32, https://jurnal.ugm.ac.id/v3/AJChE/article/view/8138.