Sirimongkol, Praijit. “Development of the District Health Board Operational Model, Phonphisai district, Nong Khai province”. Medical Journal of Sakon Nakhon Hospital 26, no. 2 (June 26, 2024): 1–13. accessed September 11, 2026. https://he05.tci-thaijo.org/index.php/JSakonNakHosp/article/view/2781.