@book { DieBildungstheoriedesWilhelmvonHumboldt,
    title = "Die Bildungstheorie des Wilhelm von Humboldt",
    author = "Herbert Adrian {Ortner}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640818938",
    url = "https://www.hausarbeiten.de/document/166154"
}