@book { VergleichendeAnalysederMarketingmglichkeiteninOnlineDiensten,
    title = "Vergleichende Analyse der Marketingmöglichkeiten in Online-Diensten",
    author = "Thorsten Jörn {Granzow}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832434762",
    url = "https://m.diplom.de/document/219142"
}