Boonsit, Pichamon, Wichuda Kijtorntham, and Numchai Supparerkchaisakul. “Development of Personal Growth Initiatives, Self-Leadership and Self-Directed Learning in English Among of Thai Undergraduate Students for the Free Flow of Skilled Labor in the ASEAN Community”. Journal of Behavioral Science for Development 12, no. 2 (July 2, 2020): 45–62. Accessed March 29, 2024. https://so02.tci-thaijo.org/index.php/JBSD/article/view/239950.