@book { Istwerdewrdeunantastbarsein,
    title = "Ist, werde, würde unantastbar sein",
    author = "Kirsten {Wilczek}",
    year = "2019",
    publisher = "booksnacks",
    address = "Stuttgart, Deutschland",
    url = "https://shop.digitalpublishers.de/document/456935"
}