@book { GeheimeZeugen,
    title = "Geheime Zeugen",
    subtitle = "Kriminalroman: Ein Fall für Willa Jansson, Band 6",
    author = "Lia {Matera} and Heike {Steffen}",
    year = "2022",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/953234"
}