Nasution, S. L. R.; Ginting, C. N.; Lister, I. N. E. Determination of Total Flavonoid Level and Antioxidant Activity of Ethyl Acetate Fraction of Mangkokan Leaf Extract (Nothopanax Scutellarium [Burm.F] Merr.). Open Access Maced J Med Sci 2022, 10, 1001-1005.