Watttanawongskul, Thongrob, and Rachen Noppanatwongsakorn. “The Factors Affecting Working Efficiency of Public Servants of Nongkhaem District Office, Bangkok”. Journal of Graduate MCU KhonKaen Campus 12, no. 1 (March 29, 2025): 307–319. accessed September 1, 2026. https://so02.tci-thaijo.org/index.php/jg-mcukk/article/view/275334.