Sriwichai, C., C. Duangfai, N. Paicharoen, and S. Yuensak. “A Development of English Proficiency Test for Undergraduate Students of the University of Phayao”. Trends of Humanities and Social Sciences Research, vol. 11, no. 2, Sept. 2023, pp. 123-42, https://so03.tci-thaijo.org/index.php/Humanties-up/article/view/262725.