“Optimization and Validation of Caffeine in Robusta Coffee (Coffea canephora), Black Tea (Camellia sinensis), and Cocoa (Theobroma cacao L.) Using RP-HPLC Liquid-liquid Extraction”, J Pharm Sci Community, vol. 23, no. 1, pp. 114–123, Jun. 2026, doi: 10.24071/jpsc.v23i1.1086.