บุญประเสริฐ อ., คำชาย พ., and มั่งคั่ง พ. “STUDENT’S SKILL DEVELOPMENT IN 21TH CENTURY BY PARTICIPATORY ACTION RESEARCH: A CASE STUDY IN THE SMALL SIZED SCHOOLS UNDER THE OFFICE OF PRIMARY EDUCATIONAL SERVICE AREA 1”. Journal of MCU Nakhondhat, vol. 6, no. 10, Jan. 2020, pp. 6071-8, https://so03.tci-thaijo.org/index.php/JMND/article/view/225298.