Widiastuti, Nurul. “Adsorpsi Metilen Biru Dan Kongo Merah Pada Zeolit-X Hasil Sintesis Dari Abu Dasar”. SPECTA Journal of Technology 3, no. 3 (December 31, 2019): 20–35. Accessed November 6, 2025. https://journal.itk.ac.id/index.php/sjt/article/view/157.