Jamrassri, P., and S. Soparat. “The Development of Integrated Approach Instruction Model for Developing CEFR English Writing Skills of Pre-Service Teachers”. Journal of Multidisciplinary in Humanities and Social Sciences, vol. 9, no. 1, Feb. 2026, pp. 344-61, https://so04.tci-thaijo.org/index.php/jmhs1_s/article/view/282849.