J. P. Sinurat, R. M. B. Karo, dan R. Berutu, “Determination of Total Flavonoid Content of Saputangan Leaves (Maniltoa grandiflora (A. Gray) Scheff) and Its Ability as Antioxidant”, J. Sains. Kes, vol. 4, no. 3, hlm. 275–279, Nov 2024, Diakses: Sep 19, 2026. Tersedia pada: https://jsk.ff.unmul.ac.id/index.php/JSK/article/view/553