N. A. O. Buhang, S. Nuryanti, and D. K. Walanda, “Antioxidant Activity Test of Red Spinach’s Extract (Blitum rubrum) in Ethanol Solvent and Water Solvent with DPPH”, J. Akademika Kimia, vol. 8, no. 3, pp. 153–159, Aug. 2019.