@article{PrengelHeinzelCarle2008,
  author    = {Annedore Prengel and Friederike Heinzel and Ursula Carle},
  title     = {Methoden der Handlungs-, Praxis- und Evaluationsforschung},
  doi       = {10.1007/978-3-531-91095-6_7},
  url       = {http://www.springerlink.com/content/h3n875/},
  year      = {2008},
}