K. Ngibad, S. N. H. Yusmiati, S. D. Santoso, F. Inayah, and R. D. N. Faizi, “In Vitro Antioxidant Activity, Flavonoid and Phenolic Contents of 70% Methanol Extract from Purple and Yellow Passion Fruit Peel”, Indo. J. Chem. Env., vol. 6, no. 2, pp. 54–62, Dec. 2023.