@book { WissensmanagementinvirtuellenGemeinschaften,
    title = "Wissensmanagement in virtuellen Gemeinschaften",
    author = "Marc {Lange}",
    year = "2000",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832425432",
    url = "https://m.diplom.de/document/218336"
}