Phonnong, Isara, and Wasana Keeratichamroen. 2023. “A STUDY OF THE ACHIEVEMENT USING THE SANDBOX COURSE ON A COMPETENCY-BASED LEARNING MANAGEMENT MODELS WITH WORK-BASED LEARNING TO ENHANCE BASIC EDUCATION STUDENTS’ LEARNING COMPETENCIES”. Research Community and Social Development Journal 17 (3). Nakhon Ratchasima, Thailand:141-53. https://doi.org/10.14456/nrru-rdi.2023.41.