Thongfueang, A., C. . Uanwung, and A. . Suikraduang. “To Develop Learning Activities Using Subject Mind Maps Sukhothai Kingdom Grade 4”. Journal of Research and Development Institute Rajabhat Maha Sarakham University, vol. 9, no. 2, Aug. 2022, pp. 579-88, https://so03.tci-thaijo.org/index.php/rdirmu/article/view/255123.