Brunk, Jevon, Maurizio Caporali, and Elisa Rubegni. “3is: Enhancing Learning and Teaching Activity through the Manipulation of Objects”. Journal of e-Learning and Knowledge Society 3, no. 2 (November 16, 2009). Accessed December 4, 2024. https://je-lks.org/ojs/index.php/Je-LKS_EN/article/view/34.