@book { QualittssicherungimGesundheitswesen,
    title = "Qualitätssicherung im Gesundheitswesen",
    author = "Mechthild {Horstrup}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832414146",
    url = "https://m.diplom.de/document/217273"
}