@book{LittkemannHoltupSchulte2006,
  author    = {J. Littkemann and M. Holtup and K. Schulte},
  title     = {Buchf{\"u}hrung: Grundlagen - {\"U}bungen - Klausurvorbereitung},
  isbn      = {3409127070},
  year      = {2006},
}