Illing, Ilmiati, et al. “ANALISIS KADAR SENYAWA FLAVONOID EKSTRAK ETANOL BUAH DENGEN (Dillenia Serrata) MENGGUNAKAN SPEKTROFOTOMETER UV-VIS”. Cokroaminoto Journal of Chemical Science, vol. 3, no. 1, Sept. 2021, pp. 5-8, https://science.e-journal.my.id/cjcs/article/view/72.