@book { KaufenTauschenTeilen,
    title = "Kaufen, Tauschen, Teilen",
    subtitle = "Musik im Internet",
    author = "Sonja {Haug} and Karsten {Weber}",
    year = "2002",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093579"
}