Link utili:
- http://www.ech.ch/
- http://www.bakom.admin.ch/org/grundlagen/00563/00564/00682/index.html?lang=it
- http://www.ejpd.admin.ch/ejpd/it/home.html
- http://www.seco.admin.ch/sas/index.html?lang=it
- http://www.seco.admin.ch/sas/00229/02208/index.html?lang=it
- http://www.seco.admin.ch/sas/00229/00251/index.html?lang=it