Siriratpaibool, Weerawat. 2025. “Guidelines for estimating an appropriate wastewater treatment system: A case study of Health Region 8, Udon Thani Province”. Journal of Health Promotion and Environmental Health Research Health Promotion Centre 8 Udon Thani 3 (3). Udon Thani,Thailand:48-67. https://he04.tci-thaijo.org/index.php/hpc8Journal/article/view/3589.