Não informado. (1987). Education and Training in Mental Retardation and Developmental Disabilities. Council for Exceptional Children, Division on Mental Retardation.
Chicago-Zitierstil (17. Ausg.)Não informado. Education and Training in Mental Retardation and Developmental Disabilities. Reston, Va: Council for Exceptional Children, Division on Mental Retardation, 1987.
MLA-Zitierstil (8. Ausg.)Não informado. Education and Training in Mental Retardation and Developmental Disabilities. Council for Exceptional Children, Division on Mental Retardation, 1987.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.