Makkon N, Nak-Ai N. A Study of the Relationship between Leadership of School Administrators in the 21st Century and Effectiveness in Sufficiency School Administration under the Phitsanulok Primary Educational Service Area Office 3: ฺ. Ratchaphruek [internet]. 2023 Aug. 17 [cited 2026 Sep. 12];21(2):190-205. available from: https://so05.tci-thaijo.org/index.php/Ratchaphruekjournal/article/view/263808