@book { DieWerkttigeninDEFASpielfilmen,
    title = "Die Werktätigen in DEFA-Spielfilmen",
    author = "Sabine {Brummel}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/227734"
}