Prasetsang, C., and S. . Piasiri. “The Learning Result of Visual Art Subject for Grade 2 Students by Lesson Study and Open Approach”. Journal of Research and Development Institute Rajabhat Maha Sarakham University, vol. 9, no. 2, Aug. 2022, pp. 543-58, https://so03.tci-thaijo.org/index.php/rdirmu/article/view/261040.