Não informado. (2009). Intellectual and Developmental Disabilities. American Association on Intellectual and Developmental Disabilities.
Chicago-referens (17:e uppl.)Não informado. Intellectual and Developmental Disabilities. Washington: American Association on Intellectual and Developmental Disabilities, 2009.
MLA-referens (8:e uppl.)Não informado. Intellectual and Developmental Disabilities. American Association on Intellectual and Developmental Disabilities, 2009.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.