1. Diagnostic and statistical manual of mental disorders,1980
2. Diagnostic and statistical manual of mental disorders,1987
3. Diagnostic and statistical manual of mental disorders,1994
4. A prevalence study of pervasive developmental disorders in North Dakota;Burd;Journal of the American Academy of Child and Adolescent Psychiatry,1987
5. Pervasive disintegrative disorder;Burd;Developmental Medicine and Child Neurology,1989