PENETAPAN KADAR FLAVONOID EKSTRAK ETANOL KULIT BUAH JERUK GERGA LEBONG DENGAN METODE SPEKTROFOTOMETRI UV-VIS: DETERMINATION OF FLAVONOID LEVELS OF ETHANOL EXTRACT OF ORANGE SKIN OF GERGA LEBONG FRUIT WITH UV-VIS SPECTROPHOTOMETRY METHOD. JPFI 2022, 11, 20-23.