YULIYANA, Y.; MARLIZA, H.; BADAR, M. .; YUSRI, Y. F. . Analysis of Caffeine Levels in Imported Coffee Drinks Circulating in Batam City by Using the UV Spectrophotometric Method: Analisis Kadar Kafein Pada Minuman Kopi Import Yang Beredar Dikota Batam dengan Menggunakan Metode Spektrofotometri UV . Ahmar Metastasis Health Journal, [S. l.], v. 1, n. 3, p. 106–111, 2021. DOI: 10.53770/amhj.v1i3.62. Disponível em: http://journal.ahmareduc.or.id/index.php/AMHJ/article/view/62. Acesso em: 29 oct. 2025.