Guntarti, A., J. Annisa, M. Mughniy, and F. Rizqi. “Effect of Regional Variation on the Total Flavonoid Level of Ethanol Extract of Mangosteen (Garcinia Mangostana) Peels”. JKKI : Jurnal Kedokteran Dan Kesehatan Indonesia, vol. 8, no. 2, June 2017, pp. 136-43, doi:10.20885/JKKI.Vol8.Iss2.art9.