Ou-ngern, N. and Visitnitikija, C. (2020) “Services Quality Development of Bangpakok 9 Hospital ”, Journal of Roi Et Rajabhat University, 14(1), pp. 210–220. available at: https://so03.tci-thaijo.org/index.php/reru/article/view/200704 (accessed: 13 September 2026).