Butngam O, Srisombut I, Thotong D. The Study of Larning Outcomes and Problem Solving Skll Toward Grade Students Taught by Problem Based Learning. ambj [Internet]. 2017 Jun. 25 [cited 2024 May 18];2(1):74-82. Available from: https://so06.tci-thaijo.org/index.php/ambj/article/view/241617