Tapa, J., P. Thammasit, and C. Sichomphoo. “The Guidelines for Change Management on Learning Process Development of Small-Sized Schools Under Phitsanulok Primary Education Service Area 3”. Journal of Graduate Research, Vol. 11, no. 2, Dec. 2020, pp. 149-62, https://so02.tci-thaijo.org/index.php/banditvijai/article/view/240960.