พรหมบึงลำ สาวิตตรี, and Wasana Keeratichamroen. “A STUDY OF LEARNING ACHIEVEMENT AND PROBLEM SOLVING ABILITY OF GRADE 4 STUDENTS USING PROBLEM–BASED LEARNING WITH QUESTION TECHNIQUE”. Research Community and Social Development Journal 15, no. 4 (December 8, 2021): 246–259. accessed April 9, 2025. https://so04.tci-thaijo.org/index.php/NRRU/article/view/252376.