Pramual, W., and R. Siriphongworakun. “Professional Learning Community Development in Literature Integration Learning to Enhance Conceptual Thinking Skill of Mathayomsueksa 3 Mahasarakham University Demonstration School (secondary)”. Journal of Research and Development Institute Rajabhat Maha Sarakham University, vol. 8, no. 1, Apr. 2021, pp. 463-78, https://so03.tci-thaijo.org/index.php/rdirmu/article/view/246680.