Rizkina, Manisyah, Machrani Adi Putri Siregar, and Ana Uzla Batubara. “Deli River Water Quality Control In Medan City Using Statistical Methods Quality Control”. Jurnal Pijar Mipa 19, no. 2 (March 30, 2024): 372–379. Accessed November 23, 2024. http://jurnalfkip.unram.ac.id/index.php/JPM/article/view/6591.