Anuttaranggoon, R., and N. Sattayawatee. “Effects of the centralization through the online teaching policy of the Ministry of Education during the Covid-19 epidemic: A case study of a small school in one sub-district in Nakhon Sawan Province”. Humanities and Social Sciences Nakhonsawan Rajabhat University Academic Journal, vol. 9, no. 2, Dec. 2022, pp. 55-67, https://so05.tci-thaijo.org/index.php/hssnsru/article/view/260578.