@book { QualittsmanagementAmBeispielderJugendhilfe,
    title = "Qualitätsmanagement - Am Beispiel der Jugendhilfe",
    author = "Kristin {Sonnenberg}",
    year = "1999",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832416225",
    url = "https://m.diplom.de/document/217501"
}