Marjoni, Mhd. Riza, Suci Enika Trijuanda, and Nhila Putri Evani. “Analysis of Tannin and Catechin Levels in Ethyl Acetate Extract of Gambir Twigs (Uncaria Gambir Roxb.) Using UV-Vis Spectrophotometry ”. Science Midwifery 13, no. 3 (July 21, 2025): 735–744. Accessed April 21, 2026. https://www.midwifery.iocspublisher.org/index.php/midwifery/article/view/2013.