1Thomas D.Snyder,120 Years of American Education : A Statistical Portrait, Center for Edllcation.
2Kevin Carey, EDUCATION FUNDING AND LOW-INCOME CHILDREN:A REVIEW OF CURRENT RESEARCH,http ://www.cbpp. org, cms/index.cfrn?fa=view&id= 1428.
3http://www.publiopurposc.com/gr-cdada.htm.
4Vincent Carpentier,Public Expenditure on Education and Economic Growth in the USA in the Nicteenth and Twenticth Centuries in comparative Perspective,http ://eprints.ioe.uk/1463/1/Carpenticr 2006 Public24.pdf.
