2Cattagni A,Farris E.Internet access in U.S.public schools and classrooms:1994-2000[DB/OL]. http://nces.ed.gov/pubs2001/2001071.pdf,2004-08-10.
3Kerrey B,Isakson J.The power of the internet for learning:moving from Mike Kennedy American school & university.2001[DB/OL].http://asumagcom/ar/university_online_exclusive_making/,2004-08-12.