@book { AktuelleStrukturderMedienwirtschaft,
    title = "Aktuelle Struktur der Medienwirtschaft",
    author = "Friedrich {Böhm}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832466749",
    url = "https://m.diplom.de/document/222055"
}