1. American Psychological Association. (2002). Ethical principles of psychologists and code of conduct. Retrieved from:
http://www.apa.org/ethics/code/
2. American Psychological Association. (2016). About APA. Retrieved from:
http://www.apa.org/about/index.aspx
3. Benjamin, L. T., Jr. (2009). A history of psychology: Original sources and contemporary research (3rd ed.). Malden: Blackwell Publishing.
4. Dewsbury, D. A. (1997). On the evolution of divisions. American Psychologist, 52, 733–741.
https://doi.org/10.1037/0003-066X.52.7.733
.
5. Evans, R. B., Sexton, V. S., & Cadwallader, T. C. (Eds.). (1992). The American Psychological Association: A historical perspective. Washington, DC: American Psychological Association.