@book{9783865963291,
  title = {Sprachlernberatung für DaF},
  editor = {Stefanie Vogler,Sabine Hoffmann},
  publisher = {Frank \& Timme},
  year = {2011},
  edition = {1},
  url = {https://www.frank-timme.de/de/programm/produkt/sprachlernberatung\_fuer\_daf}
}