] . (2004). Lernaufgaben beim E-Learning. In , Handbuch E-Learning (Bd. Kap. 4.19). Köln: Wolters-Klouwer.
(221.74 KB). (2017). Development Process of E-Learning at the University of Duisburg-Essen: Lessons Learnt and Future Tasks. ()EDULearn17. Proceedings of the 9th International Conference on Education and New Learning Technologies. gehalten auf der 2017, Spain: IATED. doi:10.21125/edulearn.2017