@electronic{horster2015suchmaschinenmarketing,
  address = {Konstanz [u.a.]},
  author = {Horster, Eric},
  format = {ebook},
  interhash = {9c9f55b935fab71c7c8c309c5a6c9c8d},
  intrahash = {e4a8c771323584a6132fd585181c8f80},
  isbn = {9783838542089 (Sekundärausgabe)},
  primaryauthor = {Horster, Eric},
  publisher = {UVK-Verl.-Ges.[u.a.]},
  series = {UTB},
  shortsubtitle = {: digitales Tourismusmanagement},
  shorttitle = {Suchmaschinenmarketing im Tourismus : digitales Tourismusmanagement},
  subtitle = {[Elektronische Ressource] : digitales Tourismusmanagement / Eric Horster},
  title = {Suchmaschinenmarketing im Tourismus : digitales Tourismusmanagement},
  titlestatement = {Eric Horster},
  uniqueid = {HEB357251741},
  url = {http://www.utb-studi-e-book.de/9783838542089},
  volume = {4208 : Tourismus},
  year = 2015
}

@electronic{kreutzer2014praxisorientiertes,
  address = {Wiesbaden},
  author = {Kreutzer, Ralf T},
  edition = {2., vollst. überarb. u. erw. Aufl. 2014},
  format = {ebook},
  interhash = {4974e3f7f1e09ef2a8538992d8b5ac43},
  intrahash = {689812577fc622c0a64335b0156250e0},
  isbn = {3658023902 (Sekundärausgabe)},
  primaryauthor = {Kreutzer, Ralf T},
  publisher = {Imprint: Springer Gabler},
  shortsubtitle = {: Konzepte - Instrumente - Checklisten},
  shorttitle = {Praxisorientiertes Online-Marketing : Konzepte - Instrumente - Checklisten},
  subtitle = {[Elektronische Ressource] : Konzepte - Instrumente - Checklisten / von Ralf T. Kreutzer},
  title = {Praxisorientiertes Online-Marketing : Konzepte - Instrumente - Checklisten},
  titlestatement = {von Ralf T. Kreutzer},
  uniqueid = {HEB338440844},
  url = {http://scans.hebis.de/HEBCGI/show.pl?33844084_cov.jpg},
  year = 2014
}

@electronic{hinterholzer2013social,
  address = {Berlin, Heidelberg},
  author = {Hinterholzer, Thomas and Jooss, Mario},
  format = {ebook},
  interhash = {c93cb9676cb08bbc9253951a8003d86f},
  intrahash = {ed962a9fe0f2a5647fb2c6f8ec2bb5f7},
  isbn = {3642379524 (Sekundärausgabe)},
  primaryauthor = {Hinterholzer, Thomas},
  publisher = {Imprint: Springer Gabler},
  shorttitle = {Social Media Marketing und -Management im Tourismus},
  subtitle = {[Elektronische Ressource] / von Thomas Hinterholzer, Mario Jooss},
  title = {Social Media Marketing und -Management im Tourismus},
  titlestatement = {von Thomas Hinterholzer, Mario Jooss},
  uniqueid = {HEB332097048},
  url = {http://scans.hebis.de/HEBCGI/show.pl?33209704_toc.html},
  year = 2013
}

@electronic{alpar2015strategie,
  address = {Wiesbaden},
  author = {Alpar, Andre and Koczy, Markus and Metzen, Maik},
  format = {ebook},
  interhash = {0d412083f2af86d57053a37665b7eab2},
  intrahash = {843231f2e3526ecd70d725857d97efd9},
  isbn = {3658022353 (Sekundärausgabe)},
  primaryauthor = {Alpar, Andre},
  publisher = {Imprint: Springer Gabler},
  shortsubtitle = {: Online-Marketing mittels effektiver Suchmaschinenoptimierung},
  shorttitle = {SEO - Strategie, Taktik und Technik : Online-Marketing mittels effektiver Suchmaschinenoptimierung},
  subtitle = {[Elektronische Ressource] : Online-Marketing mittels effektiver Suchmaschinenoptimierung / von Andre Alpar, Markus Koczy, Maik Metzen},
  title = {SEO - Strategie, Taktik und Technik : Online-Marketing mittels effektiver Suchmaschinenoptimierung},
  titlestatement = {von Andre Alpar, Markus Koczy, Maik Metzen},
  uniqueid = {HEB358590671},
  url = {http://dx.doi.org/10.1007/978-3-658-02235-8},
  year = 2015
}