PENGUKURAN TOTAL COLIFORM OULET IPAL LABORATORIUM DINAS LINGKUNGAN HIDUP PROVINSI SUMATERA BARAT MELALUI METODE MPN. Trigonometri : Journal Matematika dan Ilmu Pengetahuan Alam, [S. l.], v. 8, n. 1, p. 1011–1020, 2025. Disponível em: https://cibjournal.com/index.php/trigonometri/article/view/5010. Acesso em: 2 oct. 2026.