R. Wulandari, M. A. K. Budiyanto, and L. Waluyo, “THE INFLUENCE OF VARIOUS CONCENTRATION OF RED ROSES (ROSA DAMASCENA MILL) FLOWER EXTRACT TO ANTHOCYANIN COLOR STABILITY JELLY AS BIOLOGY LEARNING SOURCE”, JPBI, vol. 2, no. 1, pp. 48–56, Jul. 2016.