Thongkamkaew, W., A. . NaRanong, and A. . Thepmongkol. “The Analysis of the Determinants That Affect Education Expenditure in Low Income Countries and Lower Middle Income Countries”. Parichart Journal, vol. 34, no. 1, Apr. 2021, pp. 176-91, https://so05.tci-thaijo.org/index.php/parichartjournal/article/view/240196.