@book { UnbrokenSoul,
    title = "Unbroken Soul",
    subtitle = "Boston Mafia Imperium",
    author = "Sanja {Kellath}",
    year = "2023",
    publisher = "dp DIGITAL PUBLISHERS GmbH",
    address = "Stuttgart, Deutschland",
    url = "https://shop.digitalpublishers.de/document/1335919"
}