@book { DigitalerVideofilm,
    title = "Digitaler Videofilm",
    subtitle = "Vom Kamerakauf zum fertigen Film. Schritt für Schritt verständlich erklärt",
    author = "Bernhard {Kämmer}",
    year = "2010",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403417"
}