Sulistyo, H., W. B. Sediawan, S. Sarto, Y. Yusuf, dan R. Nainggolan. Water Treatment by Coagulation-Flocculation Using Ferric Sulphate As Coagulant. Vol. 12, no. 1, Desember 2012, hlm. 42-50, https://jurnal.ugm.ac.id/v3/AJChE/article/view/8121.