1. Akwan search engine: Main page.
http://www.akwan.com
, 1999.
2. Nua internet - how many online.
http://www.nua.ie
/surveys/how_many_online, 2001.
3. Google search engine.
http://www.google.com
, 2002.
4. Netcraft Web server survey.
http://www.netcraft.com
/survey, 2002.
5. Todocl - todo chile en internet.
http://www.todocl.cl
, 2002.