@book { sthetischeErziehungbeiFriedrichSchiller,
    title = "Ästhetische Erziehung bei Friedrich Schiller",
    author = "E. {Appel}",
    year = "2002",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640047000",
    url = "https://www.hausarbeiten.de/document/106421"
}