@book{BauerEnglertGartenetal.1997,
  author    = {Bauer, J{\"u}rgen and Englert, Wolfgang and Garten, Gerd and Mack, Wolfgang and Meier, Uwe and Morgeneyer, Frank},
  title     = {Seydlitz Geographie 10 : Sch{\"u}lerbd., Sekundarstufe 2, Gymansium},
  publisher = {Schroedel},
  address   = {Hannover},
  isbn      = {3-507-52510-0},
  pages     = {144 S.},
  year      = {1997},
  language  = {de}
}
@book{BricksBuetowBuetowetal.2000,
  author    = {Bricks, Wolfgang and B{\"u}tow, Heike and B{\"u}tow, Martin and Herzig, Reinhard and Morgeneyer, Frank and Untisz, M.},
  title     = {Seydlitz Geographie 10 : Arbeitsheft, Gymnasium Sachsen},
  publisher = {Schroedel},
  address   = {Hannover},
  isbn      = {3-507-52529-1},
  pages     = {32 S.},
  year      = {2000},
  language  = {de}
}