Jinyi Yan, and Jingyao Zheng. “The Application of the Combination of Number and Shape in the Process of Mathematics Learning”. International Journal of Engineering and Management Research 9, no. 3 (June 29, 2019): 38–39. Accessed July 22, 2024. https://ijemr.vandanapublications.com/index.php/ijemr/article/view/386.