@book{Grafm{\"u}llerRaßM{\"o}slein2015,
  author    = {Grafm{\"u}ller, Leontin Karl and Raß, Matthias and M{\"o}slein, Kathrin M.},
  title     = {Die Genossenschaft im Web 2.0: Social Media richtig einsetzen},
  year      = {2015},
  language  = {de}
}