Saputri, Revita, et al. “Antioxidant Activity of Ethanolic Extract from Tandui Leaves (Mangifera Rufocostata Kosterm.) by DPPH Radical Scavenging Method”. Borneo Journal of Pharmacy, vol. 2, no. 2, Nov. 2019, pp. 114-8, https://doi.org/10.33084/bjop.v2i2.1070.