Unruean, P. “The Implementation of Internal Quality Assurance System of the Schools under The Nong Bua Lam Phu Primary Educational Service Area Office 1”. Journal of Humanities and Social Sciences, Rajapruk University, vol. 10, no. 1, Apr. 2024, pp. 465-80, https://so03.tci-thaijo.org/index.php/rpu/article/view/277507.