@book{WackerKurz2011,
  author    = {Wacker, Sidonie and Kurz, Melanie},
  title     = {K{\"o}rper, Fl{\"a}chen, Schnitte : Bildlexikon f{\"u}r Gestalter},
  publisher = {av-edition},
  address   = {Ludwigsburg},
  isbn      = {978-3-89986-162-4},
  pages     = {180 S. : zahlr. Ill},
  year      = {2011},
  language  = {de}
}
@book{WitteSparla2011,
  author    = {Witte, Bertold and Sparla, Peter},
  title     = {Vermessungskunde und Grundlagen der Statistik f{\"u}r das Bauwesen},
  edition   = {7., {\"u}berarb. erw. Aufl.},
  publisher = {Wichmann},
  address   = {Heidelberg},
  isbn      = {978-3-87907-497-6},
  pages     = {XIII, 695 S. : Ill., graph. Darst.},
  year      = {2011},
  language  = {de}
}