A. Safilla, M. Ardana, and L. Rijai, “Formulasi Masker Clay Ekstrak Kelopak Bunga Rosella (Hibiscus sabdariffa L.) sebagai Antioksidan: Formulation of Clay Mask Rosella Flower Calyx Extract (Hibiscus sabdariffa L.) as an Antioxidant”, Proc. Mul. Pharm. Conf., vol. 15, no. 1, pp. 25–29, May 2022.