หลวงราช เบญญาภา. 2018. “Factors Affecting to Self-Discipline of Students of Opportunity Expansion School in Phra Nakhon Si Ayutthaya”. Journal of Educational Review Faculty of Education in MCU 4 (3):87-96. https://so02.tci-thaijo.org/index.php/EDMCU/article/view/144134.