Yahya Efendi, Renetha Salma Myesha A, Fathur Syahnuron. Analysis of Caffeine Levels in Pacitan Speciality Coffee Using UV-Visible spectrophotometry. timeinphys [Internet]. 2025 Mar. 10 [cited 2025 Jul. 3];3(1):1-7. Available from: http://ejournal.universitasmandiri.ac.id/index.php/timeinphys/article/view/151