Khawtong, Suthatip. “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, no. 1 (March 8, 2021): 133–145. Accessed April 25, 2024. https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/251569.