@book { PolnischeSprachenachderWende1989,
    title = "Polnische Sprache nach der Wende 1989",
    author = "Malgorzata {Warchol-Schlottmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106506"
}