Suryanti, Retno Indrati, Hari Eko Irianto, and Djagal Wiseso Marseno. “Comparison Study on the Extraction of Gelatin from Nila Fish (Oreochromis Nilotichus) Skin Using Acetic Acid and Citric Acid”. Pakistan Journal of Nutrition 15, no. 8 (July 15, 2016): 777–783. Accessed August 30, 2025. https://pjnonline.org/pjn/article/view/2383.