@book { ModelleundMethodenderFamilientherapie,
    title = "Modelle und Methoden der Familientherapie",
    author = "Sabine {Müller}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832446765",
    url = "https://m.diplom.de/document/220283"
}