Nurhayati, Tati, et al. “Characterization of Ammonium Sulphate Fraction Tripsin Isolated from Intestine of Little Tuna: Trypsin from Little Tuna”. Jurnal Pengolahan Hasil Perikanan Indonesia, vol. 23, no. 2, Sept. 2020, pp. 372-8, https://doi.org/10.17844/jphpi.v23i2.32221.