@article{HuebnerMuehlbauerNaumann1996,
  author    = {H{\"u}bner, Anita and M{\"u}hlbauer, Evelyn and Naumann, Martina},
  title     = {Arbeitsbuch zum Sprachbuch Jo Jo 3 : Ausgabe C},
  publisher = {Cornelsen},
  address   = {Berlin},
  year      = {1996},
  language  = {de}
}
@article{HuebnerMuehlbauerNaumann1996,
  author    = {H{\"u}bner, Anita and M{\"u}hlbauer, Evelyn and Naumann, Martina},
  title     = {Arbeitsbuch zum Sprachbuch Jo Jo 4 : Ausgabe C},
  publisher = {Cornelsen},
  address   = {Berlin},
  year      = {1996},
  language  = {de}
}
@article{HuebnerMuehlbauerNaumann1996,
  author    = {H{\"u}bner, Anita and M{\"u}hlbauer, Evelyn and Naumann, Martina},
  title     = {Sprachbuch Jo Jo 3 : Ausgabe C},
  publisher = {Cornelsen},
  address   = {Berlin},
  year      = {1996},
  language  = {de}
}
@article{HuebnerMuehlbauerNaumann1996,
  author    = {H{\"u}bner, Anita and M{\"u}hlbauer, Evelyn and Naumann, Martina},
  title     = {Sprachbuch Jo Jo 4 : Ausgabe C},
  publisher = {Cornelsen},
  address   = {Berlin},
  year      = {1996},
  language  = {de}
}