@book { SpracheundLiteratur,
    title = "Sprache und Literatur",
    author = "Gerhard P. {Knapp} and Wolff A. von {Schmidt}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1071015"
}