Newamat J. The Development of Instructional Model in English for Industrial Trades by Using Task-Based Learning and Group Investigation to Enhance English Competency of Vocational Certificate Students in Kamphaeng Phet Technical College. JDSC [internet]. 2023 Apr. 30 [cited 2026 Sep. 2];10(1):677-94. available from: https://so03.tci-thaijo.org/index.php/rdirmu/article/view/261693