Sitorus, D. I., and R. Ridwanto. “Isolation and Characterization of Chitosan from Kepah Shell Waste (Polymesoda Erosa) Percut Sei Tuan, North Sumatera”. Indonesian Journal of Science and Pharmacy, vol. 1, no. 3, Apr. 2024, pp. 100-7, doi:10.63763/ijsp.v1i3.43.