@book { EinStaatEineSprache,
    title = "Ein Staat - Eine Sprache?",
    author = "Bettina {Brinkmann} and Andreas {Buder} and Andrea {Dawin} and Anke {Osburg}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1080788"
}