Supapan, A., D. Yaimsang, and P. Srisaard. “Early Childhood Education Management for Thailand 4.0, Private Schools in Maha Sara kham Province”. Journal for Developing the Social and Community, vol. 6, no. 1, June 2019, pp. 289-02, https://so03.tci-thaijo.org/index.php/rdirmu/article/view/211471.