Sawangsri, Benchaporn. 2022. “STUDY OF MATHEMATICS ACHIEVEMENT BY USING LEARNING ACTIVITIES THAT PROMOTE PROBLEM-SOLVING SKILLS AND MATHEMATICAL CONNECTION SKILLS”. Journal of Liberal Art of Rajamangala University of Technology Suvarnabhumi 4 (1):56-68. https://so03.tci-thaijo.org/index.php/art/article/view/252488.