A. Rahayu, M. Maryudi, N. Nuraini, N. A. Z. Amrillah, I. Mulyadi, and F. F. Hanum, “Reduction of COD, pH and Phosphate Levels in Laundry Wastewater Using Multi Soil Layering (MSL) Method”, J. Sains Nat., vol. 13, no. 1, pp. 31–38, Jan. 2023.