Hamid, Abdul, Nur Hikmah, and Arif Sholahuddin. “Problem-Based Learning With Multilevel Representation: A Strategy to Master the Ionic Equilibrium in Solution Concepts”. JTK (Jurnal Tadris Kimiya) 7, no. 1 (June 30, 2022): 78–90. Accessed December 6, 2025. https://journal.uinsgd.ac.id/index.php/tadris-kimiya/article/view/10746.