Makkon, N., & Nak-Ai, N. (2023). 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 Journal, 21(2), 190–205. https://doi.org/10.14456/rpjnrru.2023.28