Nurainy, F. et al. 2022. Characteristic of Red Guava Juice Probiotic Beverages with the Addition of Cinnamon and Sappan Wood Extract. Jurnal Penelitian Pertanian Terapan. 22, 2 (Aug. 2022), 195–204. DOI:https://doi.org/10.25181/jppt.v22i2.2149.