Songklin, Prayote. “Ethics in Public Administration for the 21st Century : Pentagram Ethical Model”. Governance Journal, Kalasin University 8, no. 1 (June 30, 2019): 1–25. accessed December 9, 2025. https://so01.tci-thaijo.org/index.php/gjournal-ksu/article/view/199556.