M. Mardiah, N. Novidahlia, M. Khoirunnisa, H. Hanafi, and A. Aminullah, “A synergistic of pectinase, cellulase, and glucoamylase on anthocyanin content and extraction yield of roselle petals (Hibiscus sabdariffa L.)”, JTIHP, vol. 26, no. 2, pp. 65–71, Jun. 2021.