@book { DieKatzedieGesangstudierteBand20,
    title = "Die Katze, die Gesang studierte - Band 20",
    subtitle = "Die Bestseller-Serie",
    author = "Lilian Jackson {Braun}",
    year = "2016",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/343424"
}