@book { DerSandmann,
    title = "Der Sandmann",
    subtitle = "booksnacks (Kurzgeschichte, Krimi)",
    author = "Monika {Detering}",
    year = "2016",
    publisher = "booksnacks",
    address = "Stuttgart, Deutschland",
    url = "https://shop.digitalpublishers.de/document/322809"
}