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@BOOK{Obergfell:363152,
      author       = {Obergfell, Christoph},
      title        = {{L}angenscheidt, {D}eutsch in 30 {T}agen : der kompakte
                      {S}prachkurs , führt zu {A}2 = {G}erman in 30 days:
                      {C}oncise {L}anguage {C}ourse},
      address      = {Berlin [u.a.]},
      publisher    = {Langenscheidt},
      reportid     = {GSI-2025-01242},
      isbn         = {978-3-468-28050-4},
      series       = {Langenscheidt Selbstlernkurse "... in 30 Tagen"},
      pages        = {288 p. + 2 CDs},
      year         = {2010},
      typ          = {PUB:(DE-HGF)3},
      url          = {https://repository.gsi.de/record/363152},
}