@book { KrankenhaussozialdienstimWandel,
    title = "Krankenhaussozialdienst im Wandel",
    author = "Sven {Schäfer}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832461188",
    url = "https://m.diplom.de/document/221579"
}