@book { BildungundsozialeUngleichheit,
    title = "Bildung und soziale Ungleichheit",
    author = "Susanne {Sommer}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640379231",
    url = "https://www.hausarbeiten.de/document/129246"
}