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.