@book { DerRitterunddieRose,
    title = "Der Ritter und die Rose",
    subtitle = "Historischer Roman",
    author = "Isolde {Martyn} and Susanne {Kregeloh}",
    year = "2021",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/948226"
}