Não informado. (2011). Education and Training in Mental Retardation. Council for Exceptional Children, Division on Mental Retardation.
Chicago-Zitierstil (17. Ausg.)Não informado. Education and Training in Mental Retardation. Reston, Va: Council for Exceptional Children, Division on Mental Retardation, 2011.
MLA-Zitierstil (8. Ausg.)Não informado. Education and Training in Mental Retardation. Council for Exceptional Children, Division on Mental Retardation, 2011.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.