@book { OnlineCommunitiesimWeb20,
    title = "Online-Communities im Web 2.0",
    author = "Sebastian {Hanke}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836606059",
    url = "https://m.diplom.de/document/225406"
}