@book { FamilienChaosimGriff,
    title = "Familien-Chaos im Griff",
    author = "Melanie {Gräßer} and Eike {Hovermann}",
    year = "2013",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403341"
}