@book { SozialeUngleichheit,
    title = "Soziale Ungleichheit",
    author = "Christina {Schulz}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638485166",
    url = "https://www.hausarbeiten.de/document/52940"
}