R. Yuniarti, H. M. Nasution, S. M. B. Dachban, N. I. Putri, A. Luthfianida, and T. Wahdaniati, “Formulation, Characteristics of Physical Quality, and Evaluation of Sun Protection Factor Value of Transparent Soap with Red Betel Leaf Extract”, JPS, vol. 8, no. 2, pp. 634–641, Apr. 2025.