@book { EMailManagementbeiSparkasseninNordrheinWestfalen,
    title = "E-Mail-Management bei Sparkassen in Nordrhein-Westfalen",
    author = "Natalie {Arheiliger}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/225193"
}