@book { DerUntertanalsLernziel,
    title = "Der Untertan als Lernziel",
    author = "Nico {Mehlhorn}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640383375",
    url = "https://www.hausarbeiten.de/document/132254"
}