@book { FormenderElternarbeit,
    title = "Formen der Elternarbeit",
    author = "Hannah {Grün}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656441878",
    url = "https://www.hausarbeiten.de/document/215445"
}