Yu Y, Saleewong D, Klangphahol K. Effect of Problem-based Learning on Mathematical Problem-solving Ability of Sixth-Grade Students in Leshan Primary School. IJSASR [internet]. 2024 Jun. 21 [cited 2025 Jun. 25];4(3):583-94. available from: https://so07.tci-thaijo.org/index.php/IJSASR/article/view/4545