@book { Sprachfrderung,
    title = "Sprachförderung",
    subtitle = "Schlüssel auswärtiger Kulturpolitik",
    author = "Ulrich {Ammon}",
    year = "2001",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1090181"
}