Jucharoen N, Pongpisanu S, Boonkusol T. Comparison of Learning Achievement and Attitude Toward Thai Language Subject by Problem Based Learning with The Normal Teaching in Grade 2 Student. Saengtham Coll. J. [internet]. 2024 Dec. 20 [cited 2026 Aug. 27];16(2):267-84. available from: https://so01.tci-thaijo.org/index.php/scj/article/view/266513