@Book{Hass.2008,
  author = {Hass, Berthold H. and Kilian, Thomas and Walsh, Gianfranco},
  title  = {Web 2.0:  Neue Perspektiven für Marketing und Medien},

  year   = {2008},
  number = {},
  url    = {http://dx.doi.org/10.1007/978-3-540-73701-8},

  const  = {\ text}
}