Kosasih, Sofia Winnie, Terip Karo-Karo, and Nauas Domu Marihot Romauli. 2024. “Papaya Peel Extract and Citric Acid Addition on the Quality of Guava Jelly”. Indonesian Journal of Agricultural Research 6 (3):168 -81. https://doi.org/10.32734/injar.v6i3.11367.