@book { FamilientherapieaufsystemischerBasis,
    title = "Familientherapie auf systemischer Basis",
    author = "Cornelia {Leistner}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832431860",
    url = "https://m.diplom.de/document/218880"
}