Oi, P. Y., T. T. Teng, A. K. M. Omar, and N. A. R. N. Norulaini. “Removal of Dyes by Aqueous Mixed Coagulants”. ASEAN Journal of Chemical Engineering, Vol. 5, no. 1, Dec. 2005, pp. 52-64, https://journal.ugm.ac.id/v3/AJChE/article/view/7635.