@book { MordamMarienplatz,
    title = "Mord am Marienplatz",
    subtitle = "Historischer Kriminalroman",
    author = "Heidi {Rehn}",
    year = "2018",
    publisher = "dotbooks Verlag",
    address = "München, Deutschland",
    url = "https://www.dotbooks.de/document/425057"
}