@book { DasSchlesischeundseineSprecherlskilektijegouytkownicy,
    title = "Das Schlesische und seine Sprecher Śląski lekt i jego użytkownicy ",
    author = "Gerd {Hentschel} and Jolanta {Tambor} and István {Fekete}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b18745",
    url = "https://www.peterlang.com/document/1155002"
}