สิงห์ทองคุณาวุฒิ, and นามวรรณธรินธร. “The Development of Creative Leadership Program for Teachers in Schools under Secondary Educational Service Area Office 20”. Journal of Roi Et Rajabhat University 12, no. 1 (June 1, 2018): 160-168. Accessed May 27, 2020. https://so03.tci-thaijo.org/index.php/reru/article/view/164870.