Oktavia, R., R. Rohama, and R. Saputri. “A Antioxidant Activity And Determination Of Flavonoid Content Of Ethanol Extract Red Betel Leaf (Piper Crocatum Ruiz & Pav) With Variation Of Particle Size Simplisia Powder”. Journal Pharmaceutical Care and Sciences, vol. 4, no. 1, Nov. 2023, pp. 25-33, doi:10.33859/jpcs.v4i1.422.