1. Babbie, Earl. 1995. The Practice of Social Research. 7th ed. Belmont, CA: Wadsworth.
2. Bowlby, J. 1969. Attachment and Loss: Volume I. Attachment. 2. New York, NY: Basic Books.
3. Bowlby, J. 1973. Attachment and Loss: Volume II. Separation: Anxiety and Anger. New York, NY: Basic Books.
4. Bowlby, J. 1980. Attachment and Loss: Volume III: Loss: Sadness and Depression. New York, NY: Basic Books.
5. Boyd, C. O. 2001. “Phenomenology the Method.” In Nursing Research: A Qualitative Perspective, edited by P. L. Munhall, 93–122. Sudbury, MA: Jones and Bartlett.