คำหล้า วัชรพงษ์. “ Chiangrai Province”. Journal of the Office of Disease Prevention and Control 9 Nakhon Ratchasima 23, no. 1 (March 31, 2017): 5–17. accessed September 28, 2026. https://he02.tci-thaijo.org/index.php/ODPC9/article/view/189018.