Sunzang, D., S. Sitsira-at, D. Bhanthumnavin, and V. Vanno. “MOTIVATION AND SOCIAL SUPPORT RELATED TO SELF-DIRECTED LEARNING IN EARLY ADULTS IN NON-FORMAL EDUCATION”. Srinakharinwirot Research and Development Journal of Humanities and Social Sciences, vol. 15, no. 30, July-December, Nov. 2023, pp. 1-13, Article 269149, https://so04.tci-thaijo.org/index.php/swurd/article/view/269149.