@book { InformationsangeboteimInternetausKonsumentensicht,
    title = "Informationsangebote im Internet aus Konsumentensicht",
    author = "Lutz {Kehden}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832407421",
    url = "https://m.diplom.de/document/216650"
}