@article{PrengelHeinzelCarle2004,
  author    = {Prengel, Annedore and Heinzel, Friederike and Carle, Ursula},
  title     = {Methoden der Handlungs-, Praxis- und Evaluationsforschung},
  isbn      = {3-8100-3659-5},
  year      = {2004},
  language  = {de}
}
@article{PrengelHeinzelCarle2008,
  author    = {Prengel, Annedore and Heinzel, Friederike and Carle, Ursula},
  title     = {Methoden der Handlungs-, Praxis- und Evaluationsforschung},
  doi       = {10.1007/978-3-531-91095-6_7},
  year      = {2008},
  language  = {de}
}