http://amshq.org/ The American Montessori Society (a non-profit service organization) is a resource for educators and parents interested in the benefits of a Montessori approach in both the classroom and home setting.
http://ami-global.org/ The Association Montessori Internationale promotes the philosophy and teachings of Maria Montessori around the world.
http://amiusa.org/ The Association Montessori Internationale/USA provides a resource for educators interested in Montessori training and for parents and families wishing to incorporate the Montessori philosophy into their home setting.
http://www.montessori-namta.org/NAMTA/ The North American Montessori Teacher’s Association is a resource for Montessori research, training and education. This organization offers regional conferences for teachers and publishes The NAMTA Journal.