Lalu, Martinus, Nursamsiar Nursamsiar, Lukman Muslimin, & Sahibuddin A Gani. " Sunscreen Activing of Purple Sweet Potato (Ipomoea batatas L.) Using Spectrophotometry Method." Journal of Pharmaceutical and Medicinal Sciences [Online], 2.1 (2017): n. pag. Web. 4 May. 2024