Wichiansan, Suchon, Tuanthong Chaowakeeratiphong, and Chareonwich Sompongtam. “STRATEGY FOR LEARNING LEADERSHIP DEVELOPMENT OF SECONDARY SCHOOL ADMINISTRATORS IN PHITSANULOK PROVINCE”. JOURNAL OF EDUCATION NARESUAN UNIVERSITY 22, no. 2 (October 11, 2019): 239–248. Accessed May 28, 2022. https://so06.tci-thaijo.org/index.php/edujournal_nu/article/view/207835.