REFERENCES
- Australian Council for Educational Research . 1958 . Standard progressive matrices. Melbourne : A.C.E.R. .
- Blake , J. 1989 . Family size and achievement. Berkeley , CA : University of California Press. .
- Broom , L. , Duncan-Jones , P. , Jones , F. L. and McDonnell , P. 1980 . Investigating social mobility. New York : Oxford University Press. .
- Heer , D. M. 1985 . “ Effects of sibling number on child outcome. ” . In Annual review of sociology Edited by: Turner , R. H. and Short , J. F. 27 – 47 . Palo Alto , CA : Annual Reviews. .
- Kennedy , G. E. 1989 . Middleboms' perceptions of family relationships . Psychological Reports , 64 : 755 – 760 .
- Marjoribanks , K. 1986 . A longitudinal study of adolescents' aspirations as assessed by Seginer's model . Merrill-Palmer Quarterly , 32 : 211 – 230 .
- Merton , R. K. 1968 . Social theory and social structure. New York : Free Press. .
- Merton , R. K. 1976 . Sociological ambivalence and other essays. New York : Free Press. .
- Plomin , R. 1989 . Environment and genes: Determinants of behavior . American Psychologist , 44 : 105 – 111 .
- Powell , B. and Steelman , L. C. 1989 . The liability of having brothers: Paying for college and the sex composition of the family . Sociology of Education , 62 : 134 – 147 .
- Rosen , B. C. 1961 . Family structure and achievement motivation . American Sociological Review , 26 : 574 – 584 .
- Steelman , L. C. and Powell , B. 1989 . Acquiring capital for college: The constraints of family configuration . American Sociological Review , 54 : 844 – 855 .
- Walldén , M. 1990 . Sibling position and mental capacity—reconsidered University of Stockholm. . Project Metropolitan Research Report No. 31.