DeviH. L. N. A., SuptijahP., and NurilmalaM. “Effectiveness of Alkali and Acid to Produce Collagen from Fish Skin of Striped Catifish”. Jurnal Pengolahan Hasil Perikanan Indonesia, Vol. 20, no. 2, Aug. 2017, pp. 255-6, doi:10.17844/jphpi.v20i2.17906.