American Psychiatric Association 1994 Diagnostic and statistical manual of mental disorders. 4th ed. Washington D. C.: American Psychiatric Association.
Bailey, T., Le Couteur, A., Gottesman, I., Bolton, P., Simonoff, E., Yuzda, E., & Rutter, M. 1995 Autism as a strongly genetic disorder: evidence from a British twin study. Psychological Medicine, 25, 63-77.
Baron-Cohen, S. 1995 Mindblindness: an essay on autism and theory of mind. Boston: MIT Press-Bradford Books.
Baron-Cohen, S., & Hammer, J. 1997 Is autism an extreme form of the male brain? Advances in Infancy Research, 11, 193-217.
Baron-Cohen, S., Jollife, T., Mortimore, C., & Robertson, M. 1997 Another advanced test of theory of mind: evidence from very high functioning adults with autism or Asperger syndrome. Journal of Child Psychology and Psychiatry, 38, 813-822.