1. American Psychiatric Association (1994). Diagnostic and statistical manual of mental disorders (4th ed.). Washington DC: American Psychiatric Association.
2. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). New York: Academic Press.
3. & (2001). Closing the gap. Paper presented at the BDA 6th international conference on dyslexia, York, UK.
4. (2006). The Hawthorne effect, from http://en.wikipedia.org/wiki/Hawthorne_Effect
5. The Influence of Physical Fitness and Exercise upon Cognitive Functioning: A Meta-Analysis