@book { GruppenphaseninderSozialenArbeit,
    title = "Gruppenphasen in der Sozialen Arbeit",
    author = "Lysann {Uhlig}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640760350",
    url = "https://www.hausarbeiten.de/document/162301"
}