Koocharoenpisal, Numphon -. “Learning Outcomes on Chemical Hazard Using Problem-Based Learning and Project-Based Learning for Second-Year Undergraduates”. Science Essence Journal 36, no. 2 (December 28, 2020): 1–20. Accessed November 24, 2024. https://ejournals.swu.ac.th/index.php/sej/article/view/11381.