Borvornsakulcharoen, Direk, Nongnapas Thiengkamol, and Tanarat Khoowaranyoo Thiengkamol. 2015. “Model of Environmental Law Knowledge for Undergraduate”. Journal of Industrial Education 14 (3):741-48. https://ph01.tci-thaijo.org/index.php/JIE/article/view/123474.