1. Infant-mother attachment and social development: Socialization as a product of reciprocal responsiveness to signals;Ainsworth,1974
2. Patterns of attachment: A psychological study of the strange situation;Ainsworth,1978
3. Multiple regression: Testing and interpreting interactions;Aiken,1991
4. Bayley scales of infant development;Bayley,1969
5. Continuity in mental development from infancy;Bornstein;Child Development,1986