Phromphithakkul, W., and P. Vitheesawat. “The Influence of Transformational Leadership and Organizational Climate toward the Performance Efficiency of Personnel in Thongsuk College”. Journal of Public Administration Chiang Rai Rajabhat University, vol. 3, no. 1, Dec. 2019, pp. 25-43, https://so16.tci-thaijo.org/index.php/POPACRRU/article/view/302.