Pramual, W. and Siriphongworakun, R. 2021. 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. 8, 1 (Apr. 2021), 463–478.