1. Ainsworth, M. D. S., & Wittig, B. A. Attachment and exploratory behavior of one-year-olds in a strange situation. In B. M. Foss (Ed.), Determinants of infant behavior (Vol. 4). London: Methuen, 1969.
2. Ban, P., & Lewis, M. Mothers and fathers, girls and boys: Attachment behavior in the one-year-old. Merrill-Palmer Quarterly, 1974, 20(3), 195–204.
3. Bowen, M. Family therapy and family group therapy. In H. I. Kaplan & B. J. Sadock (Eds.), Group treatment of mental illness. New York: Dutton, 1972.
4. Bronfenbrenner, U. Toward an experimental ecology of human development. American Psychologist, 1977, 32, 513–531.
5. Cairns, R. B. (Ed.). The analysis of social interactions: Methods, issues, and illustrations. Hillsdale, N.J. Lawrence Erlbaum, 1979.