@book { IndividuumundIndividualittimKosmosSparta,
    title = "Individuum und Individualität im Kosmos Sparta",
    author = "Christoph {Effenberger}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640492121",
    url = "https://www.hausarbeiten.de/document/139304"
}