1. Ainsworth, M. D. S., Blehar, M. C., Waters, E., & Wall, S. (1978). Patterns of attachment: A psychological study of the strange situation. Hillsdale, NJ: Erlbaum.
2. Arredondo-Dowd, P. M. (1981). Personal loss and grief as a result of immigration. Personnel and Guidance Journal, 59(6), 376–378. doi: 10.1002/j.2164-4918.1981.tb00573.x .
3. Bowlby, J. (1973). Attachment and loss: Vol. II. Separation: Anxiety and anger. New York, NY: Basic Books.
4. Bowlby, J. (1980). Attachment and loss: Vol. III. Loss: Sadness and depression. New York, NY: Basic Books.
5. Bowlby, J. (1988). A Secure base: Parent–child attachment and healthy human development. New York, NY: Basic Books.