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Damaiyanti T, Nasution MA, Nasution HM, Yuniarti R. Determination of Caffeine Levels from Robusta Coffee Leaf Extract (Coffea canephora Pierre ex A. Froehner) and Arabica Coffee Leave (Coffea arabica L.) with High-Performance Liquid Chromatography Method. JPS [Internet]. 2023 Sep. 24 [cited 2024 Dec. 21];6(4):1544-52. Available from: https://journal-jps.com/new/index.php/jps/article/view/257