Fitri, H. A. “The METHOD VALIDATION AND DETERMINATION OF TOTAL FLAVONOIDS CONTENT IN ROSELLE WATER BASED FACE CLEANSER PRODUCTS USING UV-VIS SPECTROPHOTOMETRY”. Acta Pharmaceutica Indonesia, vol. 49, no. 2, Dec. 2024, pp. 51 -59, https://journals.itb.ac.id/index.php/acta/article/view/24600.