S. Safriana, T. S. Sirait, A. Apriani, Y. Fachrunniza, and M. Rizki, “Formulation and Evaluation of Lipstick Preparations with Hibiscus Flower Extract (Hibiscus rosa-sinensis L.) as a Natural Colourant”, JPS, vol. 9, no. 3, pp. 2465–2472, Aug. 2026.