Raja, Pada Mulia, and Nurfajriani Nurfajriani. 2017. “Preparation Adsorbent Chitosan of Shell Horseshoe Crab (Tachypleus Gigas) and Gelatine to Reduce Pb Content”. Jurnal Pendidikan Kimia 9 (1):282-85. https://doi.org/10.24114/jpkim.v9i1.6203.