Trangrattanachit, Suphak. “Volunteer development model for enhancing moral values and ethical characteristics of the student council of Omnoisophonchanoopathum School”. Mahachula Academic Journal 9, no. 1 (April 29, 2022): 213–225. accessed August 28, 2026. https://so04.tci-thaijo.org/index.php/JMA/article/view/254864.