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Buddee S, Kongson R. THE ENHANCEMENT OF PROBLEM SOLVING SKILL BY INSTRUCTIONAL MODEL BASED ON SERVICE LEARNING WITH PROBLEM BASED LEARNING FOR STUDENTS IN AN ENVIRONMENTAL IMPACTED AREA. JMND [Internet]. 2023 Feb. 28 [cited 2024 May 16];10(2):163-78. Available from: https://so03.tci-thaijo.org/index.php/JMND/article/view/268242