Sianturi, Sister, Gesha Desy Alisha, dan Febry Rahmadhani Hasibuan. “Waste to Energy: Utilization of Eggshell Catalysts in the Production of Waste Cooking Oil-Based Biodiesel”. Akta Kimia Indonesia 11, no. 1 (Juni 30, 2026): 41–52. Diakses Juli 25, 2026. https://journal.its.ac.id/index.php/kimia/article/view/9633.