Sutomo, A. ., M. . Ridwan, V. Suswidiantoro, I. M. . Pisacha, A. . Daskar, and A. S. . Rosanti. “The Caffeine Analysis in Tea Bag and Robusta Coffee Using UHPLC Methods”. International Journal of Contemporary Sciences (IJCS), vol. 1, no. 12, Oct. 2024, pp. 916-31, doi:10.55927/ijcs.v1i12.12040.