@Book{Krallmann.2007,
  author = {Krallmann, Hermann and Schönherr, Marten and Trier, Matthias},
  title  = {Systemanalyse im Unternehmen - Prozessorientierte Methoden der Wirtschaftsinformatik},

  year   = {2007},
  number = {},
  url    = {},

  const  = {\ text}
}
@Book{Hansen.2005,
  author = {Hansen, Hans Robert and Neumann, Gustaf},
  title  = {Wirtschaftsinformatik},

  year   = {2005},
  number = {},
  url    = {http://www.worldcat.org/search?qt=worldcat_org_all&q=3825226700},

  const  = {\ text}
}
@Book{Alpar.1998,
  author = {Alpar, Paul},
  title  = {Unternehmensorientierte Wirtschaftsinformatik:  Eine Einführung in die Strategie und Realisierung erfolgreicher IuK-Systeme},

  year   = {1998},
  number = {},
  url    = {},

  const  = {\ text}
}
@Book{Ferstl.1998,
  author = {Ferstl, K. Otto},
  title  = {Grundlagen der Wirtschaftsinformatik/1},

  year   = {1998},
  number = {},
  url    = {},

  const  = {\ text}
}
@Book{Scheer.1991,
  author = {Scheer, August-Wilhelm and Kruse, Christian},
  title  = {Wirtschaftsinformatik},

  year   = {1991},
  number = {},
  url    = {},

  const  = {\ text}
}