1. Ainsworth, M. D. S., Blehar, M. C., Waters, E. & Wall, S. (1978). Patterns of attachment. Hillsdale, NJ: Erlbaum.
2. Bates, J. R., & Bayles, K. (1984). Objective and subjective components in mothers' perceptions of their children from age 6 months to 3 years. Merrill-Palmer Quart., 30, 111?30.
3. Beach, F. A. (1948). Hormones and behaviour. New York: Hoeber.
4. Block, J., & Block, J. (1973). The self concept test ? year VII. Unpublished test material.
5. Caldwell, B. M. A. (1969). A new ?approach? to behavioral ecology. In J. P. Hill (Ed.), Minnesota Symposia on Child Psychology (Vol. 2). Minneapolis: University of Minnesota Press.