Siregar, Tagor M, and Fandy Kusno. “Physicochemical Characteristics and Stability of Antioxidant Extracts from Different Varieties of Purple Sweet Potato (Ipomoea Batatas L.)”. Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) 15, no. 1 (February 17, 2026): 290–300. Accessed February 20, 2026. https://jurnal.fp.unila.ac.id/index.php/JTP/article/view/11502.