@article{WittkowskeGiest2008,
  author    = {Wittkowske, Steffen and Giest, Hartmut},
  title     = {Naturbezogenes und naturwissenschaftliches Lernen im Sachunterricht},
  series = {Praxis Paedagogik},
  journal   = {Praxis Paedagogik},
  editor    = {Giest, Hartmut},
  publisher = {Klinkhardt, Westermann},
  address   = {Bad Heilbrunn},
  year      = {2008},
  language  = {de}
}
@article{WittkowskeGiest2007,
  author    = {Wittkowske, Steffen and Giest, Hartmut},
  title     = {Die Sachen mitgestalten},
  isbn      = {978-3-7815-1508-6},
  year      = {2007},
  language  = {de}
}