@book { DieProfessionalisierungimBereichSupervision,
    title = "Die Professionalisierung im Bereich Supervision",
    author = "Silvia {Fassmann}",
    year = "2018",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/453096"
}