Abas, Muhamad, Angki Irawan, and Dorkas Marpaung. “Hygiene and Sanitation of Refill Drinking Water Depots in Relation Escherichia Coli: A Quantitative Study”. Gema Lingkungan Kesehatan 23, no. 3 (July 28, 2025): 412–420. Accessed August 15, 2025. https://gelinkes.poltekkes-surabaya.ac.id/index.php/gelinkes/article/view/310.