@book { WilhelmvonHumboldtsBildungstheorie,
    title = "Wilhelm von Humboldts Bildungstheorie",
    author = "Carolin {Bengelsdorf}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640848799",
    url = "https://www.hausarbeiten.de/document/168017"
}