1. Akhtar, S. (2009). Comprehensive dictionary of psychoanalysis. London: Karnac.
2. American Psychological Association. (1927–2006). Psychological Abstracts. Washington, DC: American Psychological Association.
3. Bankart, C. P. (1997). Talking cure: A history of Western & Eastern psychotherapies. Pacific Grove: Brooks/Cole Publishing Company.
4. Bergmann, M. S. (1988). Freud’s three theories of love in the light of later developments. Journal of the American Psychoanalytic Association, 36(3), 653–672. https://doi.org/10.1177/000306518803600304.
5. Centers for Disease Control and Prevention. (2019). Data & statistics on birth defects: In the United States. Retrieved June 15, 2019 from https://www.cdc.gov/ncbddd/birthdefects/data.html.