@book { MehrsprachigeIndividuenvielsprachigeGesellschaften,
    title = "Mehrsprachige Individuen – vielsprachige Gesellschaften",
    author = "Dieter {Wolff}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1100984"
}