Ketwit, Kitinapha, and Siribhorn Bhuranahirunn. “A Development Indicators of Students’ Learning Happiness Science Subjects in High School Belongs to Nakhon Sawan Secondary Education Area Office”. Shanlax International Journal of Education 13, no. 3 (June 1, 2025): 82-90. Accessed September 11, 2025. https://www.shanlaxjournals.in/journals/index.php/education/article/view/9188.