@book { AlternativeWohnformen,
    title = "Alternative Wohnformen",
    author = "Jan Hendrik {Schönfeld}",
    year = "2005",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832486808",
    url = "https://m.diplom.de/document/223657"
}