@book { ValenzundDeutschalsFremdsprache,
    title = "Valenz und Deutsch als Fremdsprache",
    author = "Klaus {Fischer} and Eilika {Fobbe} and Stefan J. {Schierholz}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1136063"
}