Lalu, Martinus, 		Nursamsiar, Nursamsiar, 		Muslimin, Lukman, AND 		Gani, Sahibuddin.
" Sunscreen Activing of Purple Sweet Potato (Ipomoea batatas L.) Using Spectrophotometry Method" <em>Journal of Pharmaceutical and Medicinal Sciences</em> [Online], Volume 2 Number 1 (20 October 2017)