@book { GekonntredenimBeruf,
    title = "Gekonnt reden im Beruf",
    author = "Jutta D. {Blume}",
    year = "2016",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403359"
}