@Book{knappen2004schnell,
  author = {Knappen, Jörg},
  title  = {Schnell ans Ziel mit LATEX 2e},

  year   = {2004},
  number = {},
  url    = {http://scans.hebis.de/HEBCGI/show.pl?12277978_toc.pdf},

  const  = {\ text}
}