รัตนภูมิภิญโญ สมชาย. 2020. “QUALITY SERVICE ACHIEVEMENT OF KAMPHAENGSAEN SUBDISTRICT MUNICIPALITY. NAKHONPATHOM PROVINCE”. Journal of MCU Social Science Review 6 (2-03). Ayutthaya, Thailand:293-304. https://so03.tci-thaijo.org/index.php/jssr/article/view/239716.