@book { DasGeheimnisvonTregellaCastle,
    title = "Das Geheimnis von Tregella Castle",
    author = "Barbara {Michaels} and Hilde {Linnert}",
    year = "2020",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://m.dotbooks.de/document/591041"
}