Tran, Ai Lan, et al. “Extraction of Anthocyanin from Roselle (Hibiscus Sabdariffa L.) and Its Utilization As Colourants for Gummy Candy”. Dong Thap University Journal of Science, no. 17, Dec. 2015, pp. 72-78, doi:10.52714/dthu.17.12.2015.296.