Sulistyo, Hary, Wahyudi B Sediawan, Sarto Sarto, Yusuf Yusuf, dan Ronald Nainggolan. 2012. “Water Treatment by Coagulation-Flocculation Using Ferric Sulphate As Coagulant” 12 (1), 42-50. https://journal.ugm.ac.id/v3/AJChE/article/view/8121.