Kerres, M., & Lahne, M..  (2009).  The Contribution of E-Learning to the Implementation of a Lifelong Learning Perspective in Higher Education. ICODL - International Conference on Open and Distance Learning. Athens: EKT - National Documentation Center. Abgerufen von https://eproceedings.epublishing.ekt.gr/index.php/openedu/article/view/482