Piu, Carmelo, Orlando De Pietro, and Maurizio De Rose. “I-Questions of the Lesson Indexed in a WIS Oriented to the E-Learning”. Journal of e-Learning and Knowledge Society 3, no. 2 (November 16, 2009). Accessed September 18, 2020. https://www.je-lks.org/ojs/index.php/Je-LKS_EN/article/view/35.