Sabiti, F.B., Juarti, I.B. and Alfa, Z.S. 2024. Optimization of Facial Toner Preparation of Gotu Kola Leaves (Centella Asiatica) as Anti-Acne with Variations of Polysorbate 20 and Glycerin Using the Simplex Lattice Design Method. Jurnal Farmasi & Sains Indonesia. 7, 1 (Jun. 2024), 134–140. DOI:https://doi.org/10.52216/jfsi.vol7no1p134-140.