Santi, Gita Citra, and Maya Rahmayanti. “Effect of Solution PH to Indigosol Blue Adsorption on Humic Acid Isolated from Kalimantan Peat Oil”. Proceeding International Conference on Science and Engineering 2 (March 1, 2019): 193–195. Accessed July 30, 2026. https://www.sunankalijaga.org/prosiding/index.php/icse/article/view/84.