@book { InnovationimFremdsprachenunterricht,
    title = "Innovation im Fremdsprachenunterricht",
    author = "Rudolf {de Cillia} and Michaela {Haller} and Bernhard {Kettemann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1099207"
}