N. Thomas, M. A. Paneo, T. S. Tuloli, A. Ayuhastuti, and L. N. Arifin, “Formulation and Antioxidant Activity Test of Emulgel Extract of Guava (Psidium Guajava Linn.) Using DPPH (2,2-Diphenyl-1- Picrylhydrazyl) Methods ”, JFTSK, vol. 3, no. 1, pp. 53–67, Mar. 2026.