Ama, Marliandi Tamo, et al. “Vegetable Oils and Hibiscus Rosa-Sinensis Leaf Extract in Solid Soap Formulation”. Hydrogen: Jurnal Kependidikan Kimia, vol. 14, no. 3, June 2026, pp. 622-8, doi:10.33394/hjkk.v14i3.21188.