@book { DieGesandtendesKaisers,
    title = "Die Gesandten des Kaisers",
    subtitle = "Historischer Roman",
    author = "Mattias {Gerwald}",
    year = "2016",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/317140"
}