Fitriyana, R., M. Fauzi, and J. Ramadhani. “Formulation of Cushion Preparations from Duck Egg Shells and SPF Value Testing Using the UV-Vis Spectrophotometry Method”. JURNAL FARMASIMED (JFM), vol. 7, no. 1, Oct. 2024, pp. 94-102, doi:10.35451/jfm.v7i1.2312.