@book { ZumWandelderFamilie,
    title = "Zum Wandel der Familie",
    author = "Stefanie {Langner}",
    year = "2004",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638331562",
    url = "https://www.hausarbeiten.de/document/32433"
}