@incollection{ZerresLitterst,
  author    = {Zerres, Christopher and Litterst, Florian},
  title     = {Social Media-Controlling},
  series = {Handbuch Marketing-Controlling},
  publisher = {Springer Gabler},
  isbn      = {9783662504055},
  pages     = {191 -- 206},
  language  = {de}
}