สิริปิยธรรม วราลี, คิดดี กฤษณา, and ภู่พัฒน์ ผดุงชัย. 2015. “The Development of Learning Achievement and Problem Solving Ability for Grade 12 Students by Using Project-Based Learning Activities”. Journal of Industrial Education 14 (2):221-27. https://ph01.tci-thaijo.org/index.php/JIE/article/view/122341.