@book { IdentifikationsmanagementvonFuballfans,
    title = "Identifikationsmanagement von Fußballfans",
    author = "Volker {Schütz}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/225303"
}