Damaiyanti, T., Nasution, M. A. ., Nasution, H. M. and Yuniarti, R. (2023) “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”, Journal of Pharmaceutical and Sciences, 6(4), pp. 1544–1552. doi: 10.36490/journal-jps.com.v6i4.257.