ศลโกสุม สุนันท์, and โพธิสาร ไพฑูรย์. “The King Rama IX’s Wisdom and the Educational Development”. Journal of Humanities and Social Sciences, Rajapruk University 4, no. supplement (December 24, 2018): 9–21. Accessed April 19, 2024. https://so03.tci-thaijo.org/index.php/rpu/article/view/159602.