@book { SozialeUngleichheitinDeutschland,
    title = "Soziale Ungleichheit in Deutschland",
    author = "Michaela {Fischer}",
    year = "2005",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638358446",
    url = "https://www.hausarbeiten.de/document/36127"
}