Prompatima, K., P. Kajornsin, and D. Na-soontorn. “The Development of Transformational Leadership Training Program for The Student Leaders of Navamindarajudis Schools Group”. Saengtham College Journal, vol. 12, no. 1, June 2020, pp. 15-35, https://so01.tci-thaijo.org/index.php/scj/article/view/245134.