6ROBERT H. BRADLEY, ROBERT F. CORWYN. Socioeconomic status and child development [ J ]. Annual Review of Psychology ,2002 (53).
7VONNIE C. MCLOYD. Socioeconomic disadvantage and child development [ J ]. American Psychologist, 1998 (53).
8DARCY HANGO. Parental investment in childhood and educational qualifications: Can greater parental involvement mediate the effects of socioeconomic disadvantage? [ J ]. Social Science Research,2007, (36)Issue 4.