D. Sugiyanti, P. Darmadji, S. Anggrahini, C. Anwar, and U. Santoso, “Preparation and Characterization of Chitosan from Indonesian Tambak Lorok Shrimp Shell Waste and Crab Shell Waste”, Pak. J. Nutr., vol. 17, no. 9, pp. 446–453, Aug. 2018, doi: 10.3923/pjn.2018.446.453.