@book { PrventiongegenGewaltformeninderFuballfanszene,
    title = "Prävention gegen Gewaltformen in der Fußballfanszene",
    author = "Marcus {Brauer}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/227909"
}