Não informado. (2009). Intellectual and Developmental Disabilities. American Association on Intellectual and Developmental Disabilities.
Chicago-Zitierstil (17. Ausg.)Não informado. Intellectual and Developmental Disabilities. Washington: American Association on Intellectual and Developmental Disabilities, 2009.
MLA-Zitierstil (8. Ausg.)Não informado. Intellectual and Developmental Disabilities. American Association on Intellectual and Developmental Disabilities, 2009.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.