@book{bortzdoering06,
  author = {Döring, Nicola and Bortz, Jürgen},
  interhash = {d7899dd8d21b19f417a210b2a84f92ee},
  intrahash = {f19672254564b48e54fe9f976df43589},
  isbn = {978-3-540-33305-0},
  note = { Jürgen Bortz ; Nicola Döring },
  publisher = {Springer},
  publisherplace = {Heidelberg},
  title = {Forschungsmethoden und Evaluation für Human- und Sozialwissenschaftler},
  year = {2006 }
}