@techreport{HoepnerSiers2015,
  author    = {Hoepner, Gert and Siers, Carsten},
  title     = {7. Studie Vertriebskompass 2015/2016 / durchgef{\"u}hrt von der FH Aachen und der Siers \& Collegen GmbH},
  publisher = {FH Aachen},
  address   = {Aachen},
  pages     = {42 Bl.},
  year      = {2015},
  language  = {de}
}
@article{SiersHoepner2015,
  author    = {Siers, Carsten and Hoepner, Gert},
  title     = {Vertriebskompass 2016 - die Herausforderungen},
  series = {Vertriebsmanager : Magazin f{\"u}r modernes Vertriebsmanagement},
  volume    = {2015},
  journal   = {Vertriebsmanager : Magazin f{\"u}r modernes Vertriebsmanagement},
  publisher = {Quadriga Media Berlin GmbH},
  address   = {Berlin},
  issn      = {1610-5060 ; 2199-1588},
  year      = {2015},
  language  = {de}
}