Website: http://www.ghea.org/
You may also like
Website: http://www.veritashomeschoolers.org/
Website: http://sabrinaschool.wordpress.com/2007/12/16/the-charlotte-mason-approach-to-homeschooling/
Website: http://www.edgenuity.com
Website: http://www.famsf.org/fam/education/publications/ghost/