"Kabinett beschließt Netzsperren gegen Kinderpornos"Archived 2009-04-25 at the Wayback Machine(in German) (Cabinet approves blocking against child pornography), Pressestelle Bundesministerium für Wirtschaft und Technologie (Press Office Federal Ministry for Economics and Technology), 22 April 2009. Retrieved 19 June 2009.
"ONI Country Profiles", Research section at the OpenNet Initiative web site, a collaborative partnership of the Citizen Lab at the Munk School of Global Affairs, University of Toronto; the Berkman Center for Internet & Society at Harvard University; and the SecDev Group, Ottawa
"Kabinett beschließt Netzsperren gegen Kinderpornos"Archived 2009-04-25 at the Wayback Machine(in German) (Cabinet approves blocking against child pornography), Pressestelle Bundesministerium für Wirtschaft und Technologie (Press Office Federal Ministry for Economics and Technology), 22 April 2009. Retrieved 19 June 2009.