Ayuningtias, Fanny Sania, et al. “Utilization of Oil Palm Shell Waste (Elaeis Guineensis Jacq) into Activated Charcoal”. Ruwa Jurai: Jurnal Kesehatan Lingkungan, vol. 19, no. 1, June 2025, pp. 34-40, doi:10.26630/rj.v19i1.4886.