7Reynolds A,Temple J, .Age 21cost-benefit analysis of the Title I Chicago Child-Parent Center Program:Executive summary [EB/OL]. http ://www. waisman. wisc. edu/cls/ cbaex-- ecsum4.html.2008-01-25.
8The High/Scope Perry Preschool to Age 40.Larry Schweinhart & Jeanne Montie. High / Scope Educational Research Foundation. World Bank, November 17,2004.
9University of Wisconsin--Madison Institute for Research on Poverty. Inequality in America:play an Role for Human Capital Policies, Focus, 2005,23 ( 3 ), 1-10.
10Gormley,W.T., and D.Phillips.The Effects of Universal- Pre-K in Oklahoma:Research Highlights and Policy Im- plications.Unpublished manuscript.October, 2003.