@book { FlashmobsDieKunstGrenzenzuberschreiten,
    title = "Flashmobs: Die Kunst, Grenzen zu überschreiten",
    author = "Christine {Mader}",
    year = "2014",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/271855"
}