Casagranda, Milena, Andrea Molinari, and Sara Tomasini. “The Production of Learning Objects and the Activity of Facilitating Learning: An Hypothesis of Cost Quantifcation”. Journal of e-Learning and Knowledge Society 6, no. 1 (April 3, 2010). Accessed October 30, 2024. http://je-lks.org/ojs/index.php/Je-LKS_EN/article/view/387.