Kliewkamoltat, T., S. Phusri, and K. . Duangchatom. “The Characteristics Development Model for the 21st Century Teacher in Private Schools in Chaiyaphum Province”. Journal of Graduate MCU KhonKaen Campus, vol. 6, no. 3, Sept. 2019, pp. 566-79, https://so02.tci-thaijo.org/index.php/jg-mcukk/article/view/215733.