Dabutar, Nina Karina, Rasyidah, and Ulfayana Mayasari. 2024. “Isolation and Identification of Coliform Bacteria in Simbara Water Source in Galiaman Hamlet, Kerajaan Sub-District, Pakpak Bharat Regency”. Jurnal Pembelajaran Biologi: Kajian Biologi Dan Pembelajarannya 11 (1). https://jpb.ejournal.unsri.ac.id/index.php/jpb/article/view/45.