@book { DasGeheimnisderHexe,
    title = "Das Geheimnis der Hexe",
    subtitle = "Historischer Roman",
    author = "E. W. {Heine}",
    year = "2020",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/910120"
}