R. Yuliana, A. S. Daulay, R. Ridwanto, and F. Rahman, “Determination Of Total Alkaloid Content Of Yellow Wood (Arcangelisia flava (L.) Merr) Extract Based On Differences In Ethanol Concentration Using Uv-Vis Spectrophotometry Method”, IJSP, vol. 1, no. 2, pp. 42–49, Dec. 2023.