Tonkanya A, Saihong P. DEVELOPING THE PROGRAM OF TEACHERS DEVELOPMENT ON PROBLEM-BASED LEARNING INSTRUCTION FOR SCHOOLS UNDER NONGBUA LUM PHU PRIMARY EDUCATIONAL SERVICE AREA OFFICE 2. AJMBU [Internet]. 2022 Mar. 30 [cited 2024 Apr. 29];11(1):25-33. Available from: https://so01.tci-thaijo.org/index.php/AJMBU/article/view/242243