Harefa, Nelius, Arifman Gulo, and Saronom Silaban. “Analysis of BOD and COD Levels for Home Industry Wastewater: A Case Study in a Sewage Streams”. Jurnal Pendidikan Kimia 13, no. 1 (April 1, 2021): 38–47. Accessed July 2, 2025. https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/24142.