Maporn, Samneang, Nongnapas Thiengkamol, and Chatchai Thiengkamol. “Model of Knowledge of Life Cycle Assessment Plastic for Lower Secondary School Student”. Journal of Industrial Education 14, no. 3 (December 31, 2015): 749–756. Accessed April 29, 2024. https://ph01.tci-thaijo.org/index.php/JIE/article/view/123475.