Pasaribu, Ewi, Tati Nurhayati, and Mala Nurilmala. “Extraction and Characterization of Pepsin Enzyme from Tuna (Thunnus Albacares) Gastric”. Jurnal Pengolahan Hasil Perikanan Indonesia 21, no. 3 (December 28, 2018): 486–496. Accessed December 26, 2025. https://journal.ipb.ac.id/jphpi/article/view/24727.