@book { VermittlungskulturenimWandel,
    title = "Vermittlungskulturen im Wandel",
    subtitle = "Brief – E-Mail – SMS",
    author = "Joachim {Höflich} and Julian {Gebhardt}",
    year = "2003",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095109"
}