Calvani, Antonio, Giovanni Bonaiuti, and Antonio Fini. “Lifelong Learning: What Role for E-Learning 2.0?”. Journal of e-Learning and Knowledge Society 4, no. 1 (November 16, 2009). Accessed December 6, 2021. http://je-lks.org/ojs/index.php/Je-LKS_EN/article/view/261.