Inpin, Bhornsawan. “Development of an English Language Instructional Model Based on the 21st Century Learning Skills to Enhance ELLs’ Learning Achievement”. ASEAN Journal of Education 7, no. 1 (September 26, 2023): 40–48. accessed September 1, 2026. https://so01.tci-thaijo.org/index.php/AJE/article/view/269817.