Ou-ngern, Niparat, and Chinnaso Visitnitikija. “Services Quality Development of Bangpakok 9 Hospital”. Journal of Roi Et Rajabhat University 14, no. 1 (April 27, 2020): 210–220. accessed September 11, 2026. https://so03.tci-thaijo.org/index.php/reru/article/view/200704.