Sakuldee, Pornnapat, Chatchai Puttirungroj, and Sureerat Areeraksakul Konglok. “The Effects of Problem-Based Learning on Mathematical Problem-Solving Abilities and Mathematical Learning Achievement in Basic Mathematics for Careers among First-Year Vocational Certificate Students at Hat Yai Technical College, Songkhla Province”. Interdisciplinary Academic and Research Journal 6, no. 3 (May 23, 2026): e293380. accessed September 28, 2026. https://so03.tci-thaijo.org/index.php/IARJ/article/view/293380.