Wijayanti, Maria Siswi, Tuty Emilia Agustina, Muhammad Hatta Dahlan, and Dedi Teguh. 2022. “Determination of Coagulant Dosage and Stirring Time in Laboratory Wastewater Pretreatment”. Indonesian Journal of Environmental Management and Sustainability 6 (4):137-42. https://doi.org/10.26554/ijems.2022.6.4.137-142.