1. American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). Washington, DC: Author.
2. Brown, L., Sherbenou, R. J., & Johnson, S. K. (2010). Test of nonverbal intelligence (fourth q ed.). San Antonio: Pearson.
3. Columbus Group. (1991, July). Unpublished transcript of the meeting of the Columbus Group. Columbus, Ohio.
4. Dabrowski, K. (1964). Positive disintegration. Boston, Mass.: Little Brown.
5. Dąbrowski, K. (1967). Personality-shaping through positive disintegration. Boston, Mass.: Little Brown.