1. Adler, A. (1964). Social interest: a challenge to mankind. New York: Capricorn.
2. Adler, A. (1969). Understanding human nature. New York: Fawcett Crest.
3. Al Rubaie, T. (2002). The rehabilitation of the case-study method, European Journal of Psychotherapy & Counselling, 5(1), 31-47, doi:10.1080/13642530210159198
4. American Psychological Association. (2005; 2014; 2017). Society of Psychological Hypnosis: Division 30-American Psychological Association. Retrieved from http://www.apadivisions.org/division-30/about/index.aspx
5. Aristotle (1963). Metaphysics, Logic, Physics, Psychology, Ethics, Politics, Poetics. In The Philosophy of Aristotle. Translated by J.L. Creed & A.E. Wardman. New York: A Mentor Book.