คีรีรัตน์ วัลย์ลิกา, and ชาญศิลป์ วัชรินทร์. “Satisfaction of People toward the Services of Bangkhen Branch Waterworks Office, Metropolitan Waterworks Authority”. Thai Interdisciplinary and Sustainability Review 3, no. 2 (December 7, 2019): 121–128. accessed September 10, 2026. https://so03.tci-thaijo.org/index.php/JIRGS/article/view/228216.