@book { HartzIVundSozialeArbeit,
    title = "Hartz IV und Soziale Arbeit",
    author = "Melanie {Niemann}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842811829",
    url = "https://m.diplom.de/document/228401"
}