Ratana, P., and P. Chaimuangchun. “The Study of Kruba Chao Srivichai’s Characteristics As a Role Model of Ethical and Moral Global Citizenship”. Integrated Social Science Journal, Mahidol University, vol. 10, no. 1, July 2023, pp. 127-5, https://so02.tci-thaijo.org/index.php/isshmu/article/view/260385.