Pornnoi, S., N. Ngammeerith, and S. Anegasukha. “Developing Safety Indicators in Primary Schools Under the Basic Education Commission”. Ph.D. In Social Sciences Journal, vol. 10, no. 3, Dec. 2020, pp. 733-44, https://so05.tci-thaijo.org/index.php/phdssj/article/view/169591.