Elisma, E. et al. 2020. Characteristics and Antioxidant Activity of Sweet Potato Syrup (Ipomea Batatas (L) with Propylene Glycol Variation. JURNAL INFO KESEHATAN. 18, 1 (Jun. 2020), 74–79. DOI:https://doi.org/10.31965/infokes.Vol18.Iss1.403.