@book{TraueCzechMeieretal.2004,
  author    = {Heidi Traue and Olaf Czech and Bernd Meier and Helmut Meschenmoser and Dieter Mette and Ulf Stopperka},
  title     = {Arbeitslehre aktuell : Arbeit - Technik},
  isbn      = {3-486-88768-8},
  year      = {2004},
}