Fitri, Novita Cahyani, and Yussi Pratiwi. “Analisis Kadar Kafein Dalam Sampel Kopi Instan Dan Minuman Berenergi Menggunakan High Performance Liquid Chromatography (HPLC)”. JRSKT - Jurnal Riset Sains dan Kimia Terapan 9, no. 2 (December 25, 2023): 73–80. Accessed November 22, 2024. https://journal.unj.ac.id/unj/index.php/jrskt/article/view/44525.