@book { DieKommunikationstheoriePaulWatzlawicks,
    title = "Die Kommunikationstheorie Paul Watzlawicks",
    author = "Toni {Ziemer}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640459360",
    url = "https://www.hausarbeiten.de/document/137319"
}