Ulvia, Rengganis, et al. “DPPH Free Radical Scavenging Activity of Combined Leaf Extracts of Gynura Procumbens (Lour.) Merr. And Psidium Guajava L”. MEDIA ILMU KESEHATAN, vol. 14, no. 3, Dec. 2025, pp. 328-3, doi:10.30989/mik.v14i3.1799.