@book { Jugendsprachen,
    title = "Jugendsprachen",
    author = "Helga {Kotthoff} and Christine {Mertzlufft}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03996-2",
    url = "https://www.peterlang.com/document/1048242"
}