Annisa, Rahmi, et al. “Antioxidants Activity of Self-Nanoemulsifying Drug Delivery System on Dayak Onions Extract (Eleutherine Palmifolia) Using DPPH (2,2 Difenil-1- Picrylhydrazyl) Method”. Journal of Tropical Pharmacy and Chemistry, vol. 5, no. 4, Dec. 2021, pp. 396-05, doi:10.25026/jtpc.v5i4.339.