@book{QuargJungBruck2007,
  author    = {Quarg, Sabine and Jung, R{\"u}diger H. and Bruck, J{\"u}rgen},
  title     = {Allgemeine Managementlehre},
  publisher = {Erich Schmidt},
  address   = {Berlin},
  isbn      = {978-3-503-09790-6},
  pages     = {XVI, 603},
  year      = {2007},
  language  = {de}
}
@book{HesselerG{\"o}rtz2007,
  author    = {Hesseler, Martin and G{\"o}rtz, Marcus},
  title     = {Basiswissen ERP-Systeme},
  publisher = {W3L-Verlag},
  address   = {Herdecke},
  isbn      = {978-3-937137-38-4},
  pages     = {X, 406},
  year      = {2007},
  language  = {de}
}