Alpha Mangostin and Xanthone Activity on Fasting Blood Glucose, Insulin and Langerhans Islet of Langerhans in Alloxan Induced Diabetic Mice, Ratwita, Welly, Sukandar Elin Yulinah, I Adnyana Ketut, and Kurniati Neng Fisheri , Pharmacognosy Journal, January 2019, Volume 11, Issue 1, p.64-68, (2019)