คล้ำภิบาล ช. (2018) “A Study of English Communicative Abilities of Matthayomsuksa 2 Using Communicative Approach with Role Play”, Journal of Innovation and Learning Sciences, 12(1), pp. 30–41. available at: https://so02.tci-thaijo.org/index.php/EDGKKUJ/article/view/140901 (accessed: 13 September 2026).