1. Ahnert, L. (2021). Attachment to child care providers. In R. A. Thompson, J. A. Simpson, & L. J. Berlin (Eds.), Attachment: The fundamental questions (pp. 31–38). Guilford.
2. Ainsworth, M. D. S., Bell, S. M., & Stayton, D. J. (1974). Infant-mother attachment and social development. In M. P. M. Richards (Ed.), The introduction of the child into a social world (pp. 99–135). Cambridge University Press.
3. Ainsworth, M. D. S., Blehar, M. C., Waters, E., & Wall, S. (1978). Patterns of attachment. Erlbaum.
4. American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). American Psychiatric Publishing.
5. Bakermans-Kranenburg, M. J., van IJzendoorn, M. H., & Juffer, F. (2003). Less is more: Meta-analyses of sensitivity and attachment interventions in early childhood. Psychological Bulletin, 129, 195–215.