Não informado. (2011). Education and Training in Mental Retardation. Council for Exceptional Children, Division on Mental Retardation.
Chicago-referens (17:e uppl.)Não informado. Education and Training in Mental Retardation. Reston, Va: Council for Exceptional Children, Division on Mental Retardation, 2011.
MLA-referens (8:e uppl.)Não informado. Education and Training in Mental Retardation. Council for Exceptional Children, Division on Mental Retardation, 2011.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.