อรรถวิวรรธน์ ศ. (2026). Professional Administrative Competencies Affecting Educational Management Effectiveness in the 21st Century of Schools Under the Secondary Educational Service Area Office in Samut Songkhram Province. Journal of MCU Phetchaburi Review, 9(2), 46–61. retrieved from https://so03.tci-thaijo.org/index.php/JPR/article/view/301655