Al Kholif, M., I. Nurhayati, S. Sugito, D. A. Sari, J. Sutrisno, P. Pungut, and D. R. Mujiyanti. “Removal of BOD₅ and COD from Domestic Wastewater by Using a Multi-Media-Layering (MML) System: 10.32526/ennrj/21/20230202”. Environment and Natural Resources Journal, vol. 21, no. 6, Nov. 2023, pp. 534-4, https://ph02.tci-thaijo.org/index.php/ennrj/article/view/250408.