Xu, Linlin, Zezhong Yang, and Yansheng Liu. “Research on Geometry Teaching of High School Based on the Software of GeoGebra”. American Journal of Education and Learning 4, no. 2 (August 8, 2019): 248–255. Accessed May 10, 2024. http://onlinesciencepublishing.com/index.php/ajel/article/view/66.