@book { QualitativeForschunginDeutschalsFremdsprache,
    title = "Qualitative Forschung in Deutsch als Fremdsprache",
    author = "Beate {Baumann} and Sabine {Hoffmann} and Martina {Nied Curcio}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106684"
}