@article{WittkowskeGiest2007,
  author    = {Wittkowske, Steffen and Giest, Hartmut},
  title     = {Die Sachen mitgestalten},
  isbn      = {978-3-7815-1508-6},
  year      = {2007},
  language  = {de}
}
@article{GiestWittkowske2007,
  author    = {Giest, Hartmut and Wittkowske, Steffen},
  title     = {Heimatkunde in der DDR},
  isbn      = {978-3-7815-1508-6},
  year      = {2007},
  language  = {de}
}