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8Sara E.Rimm-Kaufman,Robert C.Pianta,and Martha J.Cox,"' Teachers' Judgments of Problems in the Transition to Kindergarten,"Early Childhood Research Quarterly 15(2000):147 -66.
9U.S.Census Bureau,"Table POV01,Age and Sex of All People,Family Members and Unrelated Individuals Iterated by Income-to-Poverty Ratio and Race," Current Population Survey,2003 Annual Social and Economic Supplement(Washington,D.C.,2004).
10Valerie E.Lee and David T.Burkham,Inequality at the Starting Gate:Social Background Differences in Achievement as Children Begin School (Washington,D.C.:Economin Policy Institute,2002),21-22.
