@Book{wi1-8,
	author = 	{H. R. Hansen and G. Neumann},
	title = 	{Wirtschaftsinformatik 1},
	year = 	{2001},
	month = 	{October},
	category = 	{EC, NM, data modeling, electronic markets, security, web},
	publisher = 	{8. Auflage, isbn: 3-8252-0802-8, Lucius & Lucius},
}