@article{Oswald2004,
  author    = {Oswald, Hans},
  title     = {Chapter 17 : Summary},
  isbn      = {3-8100-3842-3},
  year      = {2004},
  language  = {en}
}
@article{Oswald2004,
  author    = {Oswald, Hans},
  title     = {Politische Identit{\"a}t und freiwilliges Engagement im Jugendalter},
  year      = {2004},
  language  = {de}
}
@article{OswaldKrappmann2004,
  author    = {Oswald, Hans and Krappmann, Lothar},
  title     = {Soziale Ungleichheit in der Schulklasse und Schulerfolg},
  year      = {2004},
  language  = {de}
}