American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders (4th ed.). Washington, DC: Author.

Autism-Resources PDD Network.  (2000, August 10).  Diagnosis and Testing.    In Assessment.  Retrieved June 11, 2003, from http://www.autism-pdd.net/checklist.html 

Klin, A., Volkmar, F. R., & Sparrow, S. S. (2000). Asperger Syndrome. New York, NY: The Guilford Press.     

Scott, J., Clark, C., & Brady, M. (2000). Students with Autism. San Diego, CA: Singular Publishing Group, Inc.