Budiyanto, Ratno, et al. “Screening Flavonoids of Ethyl Acetate Extract from Matoa Tree Bark (Pometia Pinnata) Using UV-Vis Spectrophotometry Method”. Jurnal Pijar Mipa, vol. 20, no. 7, Nov. 2025, pp. 1219-24, doi:10.29303/jpm.v20i7.10099.