@book { ErziehungundWerteimWandelderZeit,
    title = "Erziehung und Werte im Wandel der Zeit ",
    author = "Thomas {Berger}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640255177",
    url = "https://www.hausarbeiten.de/document/121658"
}