@book { EinkniglichesGeheimnis,
    title = "Ein königliches Geheimnis",
    author = "Rhys {Bowen} and Sarah {Schemske}",
    year = "2020",
    publisher = "dp DIGITAL PUBLISHERS GmbH",
    address = "Stuttgart, Deutschland",
    url = "https://shop.digitalpublishers.de/document/513692"
}