@book { CyberjihadvirtuelleUmmaoderIslamonline,
    title = "Cyberjihad, virtuelle Umma oder Islam online?",
    author = "Inga {Gebauer}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836635332",
    url = "https://m.diplom.de/document/227168"
}