Boonnan, R. (2026) “Development of a Positive Psychology-Based Program to Promote Self-Directed Learning for Grade 8 Students”, Chophayom Journal, 37(2), pp. 89–104. available at: https://so01.tci-thaijo.org/index.php/ejChophayom/article/view/289818 (accessed: 2 September 2026).