@book { PlatonDerStaat,
    title = "Platon - Der Staat",
    author = "Florian {Winkler}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640775415",
    url = "https://www.hausarbeiten.de/document/161451"
}