Romadhon, Romadhon, et al. “The Difference Characteristicsof Collagen from Tilapia (Oreochromis Niloticus) Bone, Skin, and Scales”. Jurnal Pengolahan Hasil Perikanan Indonesia, vol. 22, no. 2, Aug. 2019, pp. 403-10, https://doi.org/10.17844/jphpi.v22i2.28832.