@proceedings {12267,
	title = {Development Process of E-Learning at the University of Duisburg-Essen: Lessons Learnt and Future Tasks},
	year = {2017},
	month = {2017},
	pages = {8646-8652},
	publisher = {IATED},
	address = {Spain},
	doi = {10.21125/edulearn.2017},
	url = {https://library.iated.org/publications/EDULEARN17},
	author = {Petschenka, Anke and Heinrich, Sandrina and Liebscher, J. and Helmstedt, Cornelia and van Ackeren, Isabell},
	editor = {G{\'o}mez Chova, L. and L{\'o}pez Mart{\'\i}nez, A and Candel Torres, I.}
}
@inbook { petschenka_lerna,
	title = {Lernaufgaben beim E-Learning},
	booktitle = {Handbuch E-Learning},
	volume = {Kap. 4.19},
	year = {2004},
	publisher = {Wolters-Klouwer},
	organization = {Wolters-Klouwer},
	address = {K{\"o}ln},
	author = {Petschenka, Anke and Nadine Ojstersek and Michael Kerres},
	editor = {Hohenstein, A. and Karl Wilbers}
}
@inbook { 5993,
	title = {Mediendidaktische Konzeption und Implementierung von Online Modulen in die Hochschullehre},
	booktitle = {GIS-Anwendungen und e-Learning},
	year = {2004},
	publisher = {Wichmann Verlag},
	organization = {Wichmann Verlag},
	address = {Berlin},
	author = {Michael Kerres and Petschenka, Anke},
	editor = {Kaule, Giselher and M{\"u}ller, Mark}
}
@inbook { 5992,
	title = {Nachhaltige Integration von E-Learning in die Hochschullehre},
	booktitle = {GIS-Anwendungen und e-Learning},
	year = {2004},
	publisher = {Wichmann Verlag},
	organization = {Wichmann Verlag},
	address = {Berlin},
	author = {Michael Kerres and Petschenka, Anke},
	editor = {Kaule, Giselher and M{\"u}ller, Mark}
}
@inbook { kerres_didaktisc,
	title = {Didaktische Konzeption des Online-Lernens f{\"u}r die Weiterbildung},
	booktitle = {Online-P{\"a}dagogik},
	year = {2002},
	publisher = {Schneider},
	organization = {Schneider},
	address = {Baltmannsweiler},
	author = {Michael Kerres and Petschenka, Anke},
	editor = {Lehmann, Burkhard and Bloh, Egon}
}
