Rukhayyah, Khusnul Khatimah, et al. “Studi Literatur: Uji Aktivitas Antioksidan Ekstrak Jahe Merah (Zingiber Officinale Var. Rubrum) Menggunakan Metode 2,2- Diphenyl-1-Picrylhydrazyl (DPPH): Literature Study: Antioxidant Activity Test of Red Ginger Extract (Zingiber Officinale Var. Rubrum) Using the 2,2- Diphenyl-1-Picrylhydrazyl DPPH Method”. Proceeding of Mulawarman Pharmaceuticals Conferences, vol. 15, no. 1, May 2022, pp. 242-5, doi:10.25026/mpc.v15i1.648.