@book { PrventiondurchKrankenkassen,
    title = "Prävention durch Krankenkassen",
    author = "Anna {Schröder}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836642583",
    url = "https://m.diplom.de/document/227596"
}