Sotarat, A., P. Buasuwan, S. Sarnswang, and W. Lapanachokdee. “An Influential Model of Instructional Leadership Affecting Students’ Achievement in Small-sized Secondary Schools under the Office of the Basic Education Commission in Thailand”. Asian Political Science Review, vol. 2, no. 2, Jan. 2020, pp. 96-106, https://so01.tci-thaijo.org/index.php/APSR/article/view/234086.