“Microbiological Study of Escherichia Coli Contamination in Dug Wells in Demak District, Central Java”. JURNAL GEOCELEBES 9, no. 1 (April 26, 2025): 28–42. Diakses Agustus 21, 2026. https://journal-598.unhas.ac.id/index.php/geocelebes/article/view/43184.