The best source of information about the Sudbury model of education is the Sudbury Valley School website. SVS was established in 1968 in Framingham, Massachussets.
Please feel free also to visit the websites of other successful Sudbury Schools in the U.S:
Hudson Valley Sudbury School (Kingston, NY)
Alpine Valley School (Wheat Ridge, CO)
Clearview Sudbury School (Austin, TX)
Clearwater Sudbury School (Bothell, WA)
Diablo Valley School (Concord, CA)
Sunset Sudbury Learning Community (Fort Lauderdale, FL)
Houston Sudbury School (Houston, TX)
Free at Last published by the Sudbury Valley School Press.
Free to Learn by Peter Gray, available on Amazon.com.
Peter Gray’s blog on Psychology Today