1. Ainsworth, M. D. S., Blehar, M. C., Waters, E., & Wall, S. (1978).Patterns of attachment. A psychological study of the Strange Situation. Hillsdale, N.J.: Lawrence Erlbaum.
2. Bakeman, R., & Adamson, L. B. (1984). Coordinating attention to people and objects in mother-infant and peer-infant interaction.Child Development, 55, 1278–1289.
3. Bates, E., Bretherton, I., Snyder, L., Shore, C., & Volterra, V. (1980). Gestural and vocal symbols at 13 months.Merrill-Palmer Quarterly, 26, 407–423.
4. Bates, J. E., Olson, S.L., Pettit, G. S., & Bayles, K. (1982). Dimensions of individuality in the mother-infant relationship at 6 months of age.Child Development, 53, 446–461.
5. Belsky, J., Gilstrap, B., & Rovine, M. (1984). The Pennsylvania infant and family development project, I: Stability and change in mother-infant and father-infant interaction in a family setting at one, three, and nine months.Child Development, 55, 692–705.