Mariliaty, Nani, and Tatang Suhery. “Optimization of Basic Chemistry Learning: Validation of STEM-Based Problem-Based Learning Materials for Chemical Equilibrium ”. Asian Journal Collaboration of Social Environmental and Education 2, no. 1 (July 31, 2024): 30–45. Accessed April 6, 2025. https://journal-iasssf.com/index.php/AJCSEE/article/view/909.