“Analysis Of Caffeine In Packaged Drinks Using Thin Layer Chromatography (TLC) and Spectrophotometry Method”. Stannum : Jurnal Sains dan Terapan Kimia 6, no. 1 (May 1, 2024): 28–35. Accessed June 19, 2026. https://www.journal.ubb.ac.id/index.php/stannum/article/view/4564.