• 

  Statistik Schweiz - Die Bildungssystemindikatoren

  http://wayback.archive.org/web/20090523085403/http://www.bfs.admin.ch/bfs/portal/de/index/themen/15/02/key/ind5.informations.514

• 

  Statistik Schweiz - Die Bildungssystemindikatoren

  https://web.archive.org/web/20090523085403/http://www.bfs.admin.ch/bfs/portal/de/index/themen/15/02/key/ind5.informations.51422.

• 

  Statistik Schweiz - Die Bildungssystemindikatoren

  https://web.archive.org/web/20090523085403/http://www.bfs.admin.ch/bfs/portal/de/index/themen/15/02/key/ind5.informations.51422.html

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