ทิพย์บุรี ส. “Problems and Impediments to Sufficiency Economy Schools’ Administrator in Nonthaburi Province for Thailand 4.0 Policy”. Mahamakut Graduate School Journal, vol. 14, no. 2, July 2019, pp. 15-26, https://so04.tci-thaijo.org/index.php/mgsj/article/view/201017.