A. N. W. Aura, D. Matius, K. M. W. Riani, Y. J. L. S. Dakhi, A. S. N. Fad’ah, and W. Wirhanuddin, “The Effectiveness of Project-Based Learning in Chemistry Learning: Conceptual Understanding and 21st Century Skills”, HJKK, vol. 14, no. 4, Aug. 2026.