@article{Kullak-Ublick:1603,
      author        = "Henning Kullak-Ublick  and Edwin Hubner and Celia
                       Schonstedt",
      title         = "{Struwwerlpeter 2.0. Media Competency and Waldorf
                       education; 2 Edition}",
      year          = "2015",
}