Riswanto, B. . . and Aminah, S. . (2020) “Utilization of Kalpataru Flower Extract (Hura crepitans Linn) as an Alternative Acid Base Indicator”, Jurnal Akademika Kimia. Palu, Sulawesi Tengah - INDONESIA, 9(3), pp. 148–157. doi: 10.22487/j24775185.2020.v9.i3.pp148-157.