@book { Enterprise20SocialSoftwareimUnternehmen,
    title = "Enterprise 2.0 - Social Software im Unternehmen",
    author = "Marcel {Sehr}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836634267",
    url = "https://m.diplom.de/document/227130"
}