Banchuen, Kijja, and Wimonrat Chaturanon. 2014. “Development of Instructional Model to Promote and Create in Critical Thinking for Vocational Students based on Theory of Constructivism”. Ratchaphruek Journal 12 (3):33-41. https://so05.tci-thaijo.org/index.php/Ratchaphruekjournal/article/view/240906.