@book { MarktanalysederTontrgerindustrie,
    title = "Marktanalyse der Tonträgerindustrie",
    author = "Daniela {Bräunig}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832468040",
    url = "https://m.diplom.de/document/222155"
}