@book { DieKleinsprachenderWeltExistenzbedrohungundberlebenschancen,
    title = "Die Kleinsprachen der Welt – Existenzbedrohung und Überlebenschancen",
    author = "Harald {Haarmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1091569"
}