@book { SprachenundSprechenimstdtischenRaum,
    title = "Sprachen und Sprechen im städtischen Raum",
    author = "Thomas {Krefeld}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1104803"
}