@book { SchafftdieVereinigtenStaatenvonEuropa,
    title = "Schafft die Vereinigten Staaten von Europa",
    author = "Richard {Ellerkmann}",
    year = "2023",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1319033"
}