@book { OnlineCommunitiesalsMarketingmanahme,
    title = "Online Communities als Marketingmaßnahme",
    author = "Ramona {Falk}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836621489",
    url = "https://m.diplom.de/document/226304"
}