@book { DieEntwicklungderKinderundJugendhilfe,
    title = "Die Entwicklung der Kinder- und Jugendhilfe",
    author = "",
    year = "2020",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/706674"
}