Nahak, Albertus Seran, et al. “PEMBUATAN MINUMAN PROBIOTIK DARI SARI UBI JALAR UNGU (Ipomoea Batatas L.): KAJIAN JENIS DAN KONSENTRASI STABILIZER: Probiotic Herbal Beverage From Purple Sweet Potato Juice (Ipomoea Batatas L.): Study of Stabilizer Type and Concentration”. Journal of Industrial Engineering & Technology Innovation, vol. 1, no. 2, Dec. 2023, pp. 42-49, doi:10.61105/jieti.v1i2.60.