1. . 2001. Manual for the ASEBA School-Age Forms & Profiles. Burlington, VT: University of Vermont, Research Center for Children, Youth, & Families.
2. Germline mutations in HRAS proto-oncogene cause Costello syndrome
3. Adaptive skills, cognitive, and behavioral characteristics of Costello syndrome
4. American Psychiatric Association. 1994. Diagnostic and Statistical Manual of Mental Disorders. 4th Edition. Washington, DC: American Psychiatric Association.
5. . 1997. Peabody Picture Vocabulary Test-III. Circle Pines, MN: American Guidance Services.