Wongsuay, Sutnapa. “Factors Associated with Direct Non-medical Costs of Outpatients in the Community Hospital and Health Promoting Hospitals in Kokha District: a Cross-sectional Survey”. Vajira Medical Journal : Journal of Urban Medicine 63, no. 4 (August 1, 2019): 239–246. accessed September 19, 2026. https://he02.tci-thaijo.org/index.php/VMED/article/view/212508.