@book { ZielgruppenorientiertesDesignvonOnlineMarketing,
    title = "Zielgruppenorientiertes Design von Online-Marketing",
    author = "Dörte {Wittenberg}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832434601",
    url = "https://m.diplom.de/document/219127"
}