Leofayuda, M. Sultan, et al. “COMPARATIVE EFFECTIVENESS OF ACTIVATOR HCl AND NaOH ON PALM SHELL ACTIVATED CARBON IN CRUDE PALM OIL (CPO) REFINING”. SPIN JURNAL KIMIA & PENDIDIKAN KIMIA, vol. 7, no. 2, Dec. 2025, pp. 187-96, doi:10.20414/spin.v7i2.14518.