Determination of Total Flavonoid Levels of Ethanol Extract Sesewanua Leaf (Clerodendrum Fragrans Wild) With Maceration Method Using UV-Vis Spectrofotometry, Sapiun, Zulfiayu, Pangalo Paulus, Imran Arlan K., Wicita Prisca Safriani, and Daud Rizka Puji Astut , Pharmacognosy Journal, March 2020, Volume 12, Issue 2, p.356-360, (2020)