@book { DasGeheimnisderSeerosenvilla,
    title = "Das Geheimnis der Seerosenvilla",
    author = "Gisela B. {Schmidt}",
    year = "2022",
    publisher = "dp DIGITAL PUBLISHERS GmbH",
    address = "Stuttgart, Deutschland",
    url = "https://shop.digitalpublishers.de/document/1169170"
}