Wichiansan S, Chaowakeeratiphong T, Sompongtam C. STRATEGY FOR LEARNING LEADERSHIP DEVELOPMENT OF SECONDARY SCHOOL ADMINISTRATORS IN PHITSANULOK PROVINCE. JEI [internet]. 2019 Oct. 11 [cited 2026 Oct. 4];22(2):239-48. available from: https://so06.tci-thaijo.org/index.php/edujournal_nu/article/view/207835