Fitriani, A. (2021) “Making Purple Sweet Potato Tape Flour (Ipoema batatas var.Ayamurasaki): A Study Of FermentationTime and Yeast Concentration: Pembuatan Tepung Tape Ubi Jalar Ungu (Ipomoea batatas var. Ayamurasaki) : Kajian Lama Fermentasi dan Konsentrasi Ragi”, Journal of Tropical Food and Agroindustrial Technology, 1(02), pp. 22–29. doi: 10.21070/jtfat.v1i02.1555.