@book{HesselerG{\"o}rtz2009,
  author    = {Hesseler, Martin and G{\"o}rtz, Marcus},
  title     = {ERP-Systeme im Einsatz},
  publisher = {W3L-Verlag},
  address   = {Herdecke},
  isbn      = {978-3-86834-006-8},
  pages     = {VII, 287},
  year      = {2009},
  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}
}
@book{G{\"o}rtzHesselerHoffmann2014,
  author    = {G{\"o}rtz, Marcus and Hesseler, Martin and Hoffmann, Ralf},
  title     = {Arbeiten mit dem Windows Client von Microsoft Dynamics NAV 2013 R/2},
  publisher = {Books on Demand},
  address   = {Norderstedt},
  isbn      = {978-3-7357-8560-2},
  pages     = {214},
  year      = {2014},
  language  = {de}
}