@book { DerWeihnachtsballdesEarls,
    title = "Der Weihnachtsball des Earls",
    author = "Katherine {Collins} and Dolores {Mey} and Ester D. {Jones} and Marie Caroline {Bonnet} and Dorothea {Stiller}",
    year = "2019",
    publisher = "dp DIGITAL PUBLISHERS GmbH",
    address = "Stuttgart, Germany",
    url = "https://shop.digitalpublishers.de/document/507850"
}