Akmal, A., A. A. Aji, S. W. Auvaria, S. Nengse, and Y. D. Auliansyah. “The Pollutant Index (IP) Method for Determining Water Quality Status in the Tambak Oso River Gunung Anyar”. Envirous, vol. 5, no. 2, Mar. 2025, pp. 1-7, https://envirous.upnjatim.ac.id/index.php/envirous/article/view/339.