Jantapol, Benjawan, and Suwisith changthong. 2024. “A Study of Production Process and Quality of Water Supply in Nongtum Subdistrict Municipality, Mueang District, Khon Kaen Province”. Journal of Health Promotion and Environmental Health Research Health Promotion Centre 8 Udon Thani 2 (4). Udon Thani,Thailand:110-23. https://he04.tci-thaijo.org/index.php/hpc8Journal/article/view/2001.