@book{62702,
	author = {Ben Youssef, Adel and Ben Youssef, Adel},
	title = {The Economics of E-learning},
	publisher = {Universitat Oberta de Catalunya, },
	year = {2008},
	address = {[Madrid, España] :},
	url = {https://public.digitaliapublishing.com/a/20577}
}