Kusumawati, Nita, et al. “Extraction, Characterization and Application of Natural Dyes from the Fresh Mangosteen (Garcinia Mangostana L.) Peel”. International Journal on Advanced Science, Engineering and Information Technology, vol. 7, no. 3, June 2017, pp. 878-84, doi:10.18517/ijaseit.7.3.1014.