1. On family size and intelligence;Armor;American Psychologist,2001
2. Birth order, family size and intelligence;Belmont;Science,1973
3. Comparison of associations of birth order with intelligence test score and height;Belmont;Nature,1975
4. Bjerkedal, T. (1981). The medical birth registry of Norway. In S. A. Mednick & A. E. Baert (Eds.), Prospective longitudinal research: An empirical basis for the primary prevention of psychosocial disorders. (pp. 58–60). Published on behalf of the World Health Organization Regional Office for Europe. Copenhagen: Oxford University Press.
5. Family size and the quality of children;Blake;Demography,1981