@book { FamilienformenimWandel,
    title = "Familienformen im Wandel",
    author = "Philipp {Jäger}",
    year = "2012",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656304043",
    url = "https://www.hausarbeiten.de/document/203989"
}