@book { DasMdchenmitdemSchlangenohrring,
    title = "Das Mädchen mit dem Schlangenohrring",
    author = "Robert {Gordian}",
    year = "2017",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://m.dotbooks.de/document/358469"
}