@book { SprachenpolitikundSprachkultur,
    title = "Sprachenpolitik und Sprachkultur",
    subtitle = "2., durchgesehene Auflage",
    author = "Detlev {Blanke} and Jürgen {Scharnhorst}",
    year = "2009",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106370"
}