“Penetapan kadar fenolik total ekstrak etanol, fraksi etil asetat dan n-heksan daun kopi robusta (Coffea canephora Pierre ex A. Froehner) dengan metode spektrofotometri Uv-Vis”. Journal of Pharmaceutical and Sciences 6, no. 4 (November 15, 2023): 1709–1716. Diakses Oktober 21, 2026. https://journal-jps.com/new/index.php/jps/article/view/301.