Ni`mah, L., M. Mahfud, and S. R. . Juliastuti. “Study of Activated Carbon from Coconut Shell Waste to Adsorb Cu and Mn Metals in Acid Mine Drainage”. Journal of Fibers and Polymer Composites, vol. 1, no. 1, Mar. 2022, pp. 34-42, doi:10.55043/jfpc.v1i1.35.