Vitaya-apibalkul, K. “The Effects of Using the Self-Esteem Development Activities Form to Reduce Bullying Behavior Among Student Teachers at Yala Rajabhat University”. Education Journal Faculty of Education, Nakhon Sawan Rajabhat University, vol. 5, no. 1, Apr. 2022, pp. 32-44, https://so02.tci-thaijo.org/index.php/edunsrujo/article/view/250633.