Klyprayong, Roongporn. “Confirmatory Factor Analysis of Self-directed Learning of Undergraduate Students at Faculty of Education, Ramkhamhaeng University”. Journal of Education Studies, Chulalongkorn University 51, no. 3 (September 30, 2023): EDUCU5103003. accessed September 10, 2026. https://so02.tci-thaijo.org/index.php/EDUCU/article/view/261072.