Khawtong, S. (2021). Effects of the Development of Science Learning Activities Package by Using STEM Education to Enhance the Problem Solving Ability for Grade 6 Students. Journal of Education Rajabhat Maha Sarakham University, 18(1), 133–145. Retrieved from https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/251569