Jongtaengklang, S. and Sod-ium , P.- on 2023. Factor Analysis of Ethical Leadership of School Administrators under Secondary Educational Service Area Office Loei Nong Bua Lamphu: Factor Analysis of Ethical Leadership of School Administrators under Secondary Educational Service Area Office Loei Nong Bua Lamphu. RATANABUTH JOURNAL. 5, 1 (Apr. 2023), 540–557.