“Analisis kadar parasetamol dan kafein dalam sediaan tablet menggunakan metode spektrofotometri derivatif zero crossing”. Journal of Pharmaceutical and Sciences 7, no. 3 (Agustus 11, 2024): 323–332. Diakses Oktober 23, 2026. https://journal-jps.com/new/index.php/jps/article/view/489.