@book { ChancenundRisikenvonKundenclubsimMedienbereich,
    title = "Chancen und Risiken von Kundenclubs im Medienbereich",
    author = "Ralf {Niedermeier}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832402532",
    url = "https://m.diplom.de/document/216198"
}