@book { WilhelmvonHumboldtZurTheoriederBildungdesMenschen,
    title = "Wilhelm von Humboldt. Zur Theorie der Bildung des Menschen",
    author = "Andreas {Kirchner}",
    year = "2007",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638003186",
    url = "https://www.hausarbeiten.de/document/85249"
}