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 2026 Sep. 10];10(2):163-78. available from: https://so03.tci-thaijo.org/index.php/JMND/article/view/268242